NetBSD/gnu/libexec/uucp/common_sources/system.h

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/* system.h
Header file for system dependent stuff in the Taylor UUCP package.
This file is not itself system dependent.
Copyright (C) 1991, 1992, 1993, 1994, 1995 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
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*/
#ifndef SYSTEM_H
#define SYSTEM_H
#if ANSI_C
/* These structures are used in prototypes but are not defined in this
header file. */
struct tm;
struct uuconf_system;
struct uuconf_port;
struct sconnection;
struct sstatus;
struct scmd;
#endif
/* Any function which returns an error should also report an error
message, unless otherwise indicated.
Any function that returns a char *, rather than a const char *, is
returning a pointer to a buffer allocated by zbufalc which must be
freed using ubuffree, unless otherwise indicated. */
/* The maximum length of a remote system name. */
extern size_t cSysdep_max_name_len;
/* Initialize. If something goes wrong, this routine should just
exit. The flag argument is 0, or a combination of any of the
following flags. */
/* This program needs to know the current working directory. This is
used because on Unix it can be expensive to determine the current
working directory (some versions of getcwd fork a process), but in
most cases we don't need to know it. However, we are going to
chdir to the spool directory (unless INIT_CHDIR is set), so we have
to get the cwd now if we are ever going to get it. Both uucp and
uux use the function fsysdep_needs_cwd to determine whether they
will need the current working directory, and pass the argument to
usysdep_initialize appropriately. There's probably a cleaner way
to handle this, but this will suffice for now. */
#define INIT_GETCWD (01)
/* This program should not chdir to the spool directory. This may
only make sense on Unix. It is set by cu. */
#define INIT_NOCHDIR (02)
/* This program needs special access to the spool directories. That
means, on Unix, this program is normally installed setuid. */
#define INIT_SUID (04)
/* Do not close all open descriptors. This is not used by the UUCP
code, but it is used by other programs which share some of the
system dependent libraries. */
#define INIT_NOCLOSE (010)
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extern void usysdep_initialize P((pointer puuconf, int iflags));
/* Exit the program. The fsuccess argument indicates whether to
return an indication of success or failure to the outer
environment. This routine should not return. */
extern void usysdep_exit P((boolean fsuccess));
/* Called when a non-standard configuration file is being used, to
avoid handing out privileged access. If it returns FALSE, default
configuration file will be used. This is called before the
usysdep_initialize function is called. */
extern boolean fsysdep_other_config P((const char *));
/* Detach from the controlling terminal. This probably only makes
sense on Unix. It is called by uucico to try to get the modem port
as a controlling terminal. It is also called by uucico before it
starts up uuxqt, so that uuxqt will be a complete daemon. */
extern void usysdep_detach P((void));
/* Get the local node name if it is not specified in the configuration
files. Returns NULL on error; otherwise the return value should
point to a static buffer. */
extern const char *zsysdep_localname P((void));
/* Get the login name. This is used when uucico is started up with no
arguments in slave mode, which causes it to assume that somebody
has logged in. It also used by uucp and uux for recording the user
name. This may not return NULL. The return value should point to
a static buffer. */
extern const char *zsysdep_login_name P((void));
/* Set a signal handler for a signal. If the signal occurs, the
appropriate element of afSignal should be set to the signal number
(see the declaration of afSignal in uucp.h). This routine might be
able to just use signal, but Unix requires more complex handling.
This is called before usysdep_initialize. */
extern void usysdep_signal P((int isig));
/* Catch a signal. This is actually defined as a macro in the system
dependent header file, and the prototype here just indicates how it
should be called. It is called before a routine which must exit if
a signal occurs, and is expected to set do a setjmp (which is why
it must be a macro). It is actually only called in one place in
the system independent code, before the call to read stdin in uux.
This is needed to handle 4.2 BSD restartable system calls, which
require a longjmp. On systems which don't need to do
setjmp/longjmp around system calls, this can be redefined in
sysdep.h to TRUE. It should return TRUE if the routine should
proceed, or FALSE if a signal occurred. After having this return
TRUE, usysdep_start_catch should be used to start catching the
signal; this basically tells the signal handler that it's OK to do
the longjmp, if fsysdep_catch did not already do so. */
#ifndef fsysdep_catch
extern boolean fsysdep_catch P((void));
#endif
/* Start catching a signal. This is called after fsysdep_catch to
tell the signal handler to go ahead and do the longjmp. This may
be implemented as a macro in sysdep.h. */
#ifndef usysdep_start_catch
extern void usysdep_start_catch P((void));
#endif
/* Stop catching a signal. This is called when it is no longer
necessary for fsysdep_catch to handle signals. This may be
implemented as a macro in sysdep.h. */
#ifndef usysdep_end_catch
extern void usysdep_end_catch P((void));
#endif
/* Link two files. On Unix this should attempt the link. If it
succeeds it should return TRUE with *pfworked set to TRUE. If the
link fails because it must go across a device, it should return
TRUE with *pfworked set to FALSE. If the link fails for some other
reason, it should log an error message and return FALSE. On a
system which does not support links to files, this should just
return TRUE with *pfworked set to FALSE. */
extern boolean fsysdep_link P((const char *zfrom, const char *zto,
boolean *pfworked));
/* Get the port name. This is used when uucico is started up in slave
mode to figure out which port was used to call in so that it can
determine any appropriate protocol parameters. This may return
NULL if the port cannot be determined, which will just mean that no
protocol parameters are applied. The name returned should be the
sort of name that would appear in the port file. This should set
*pftcp_port to TRUE if it can determine that the port is a TCP
connection rather than a normal serial port. The return value (if
not NULL) should point to a static buffer. */
extern const char *zsysdep_port_name P((boolean *pftcp_port));
/* Expand a file name on the local system. On Unix, if the zfile
argument begins with ~user/ it goes in that users home directory,
and if it begins with ~/ it goes in the public directory (the
public directory is passed to this routine, since each system may
have its own public directory). Similar conventions may be
desirable on other systems. This should always return an absolute
path name, probably in the public directory. It should return NULL
on error; otherwise the return value should be allocated using
zbufcpy or zbufalc. If pfbadname is not NULL, then if the function
returns NULL *pfbadname should be set to TRUE if the error is just
that the file name is badly specified; *pfbadname should be set to
FALSE for some sort of internal error. */
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extern char *zsysdep_local_file P((const char *zname,
const char *zpubdir,
boolean *pfbadname));
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/* Return whether a file name is in a directory, and check for read or
write access. This should check whether zfile is within zdir (or
is zdir itself). If it is not, it should return FALSE. If zfile
is in zdir, then fcheck indicates whether further checking should
be done. If fcheck is FALSE, no further checking is done.
Otherwise, if freadable is TRUE the user zuser should have search
access to all directories from zdir down to zfile and should have
read access on zfile itself (if zfile does not exist, or is not a
regular file, this function may return FALSE but does not have to).
If freadable is FALSE, the user zuser should have search access to
all directories from zdir down to zfile and should have write
access on zfile (which may be a directory, or may not actually
exist, which is acceptable). The zuser argument may be NULL, in
which case the check should be made for any user, not just zuser.
There is no way for this function to return error. */
extern boolean fsysdep_in_directory P((const char *zfile,
const char *zdir,
boolean fcheck,
boolean freadable,
const char *zuser));
/* Return TRUE if a file exists, FALSE otherwise. There is no way to
return error. */
extern boolean fsysdep_file_exists P((const char *zfile));
/* Start up a program. If the ffork argument is true, this should
spawn a new process and return. If the ffork argument is false,
this may either return or not. The three string arguments may be
catenated together to form the program to execute; I did it this
way to make it easy to call execl(2), and because I never needed
more than two arguments. The program will always be "uucico" or
"uuxqt". The return value should be TRUE on success, FALSE on
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error. */
extern boolean fsysdep_run P((boolean ffork, const char *zprogram,
const char *zarg1, const char *zarg2));
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/* Send a mail message. This function will be passed an array of
strings. All necessary newlines are already included; the strings
should simply be concatenated together to form the mail message.
It should return FALSE on error, although the return value is often
ignored. */
extern boolean fsysdep_mail P((const char *zto, const char *zsubject,
int cstrs, const char **paz));
/* Get the time in seconds since some epoch. The actual epoch is
unimportant, so long as the time values are consistent across
program executions and the value is never negative. If the
pimicros argument is not NULL, it should be set to the number of
microseconds (if this is not available, *pimicros should be set to
zero). */
extern long ixsysdep_time P((long *pimicros));
/* Get the time in seconds and microseconds (millionths of a second)
since some epoch. The actual epoch is not important, and it may
change in between program invocations; this is provided because on
Unix the times function may be used. If microseconds can not be
determined, *pimicros can just be set to zero. */
extern long ixsysdep_process_time P((long *pimicros));
/* Parse the value returned by ixsysdep_time into a struct tm. I
assume that this structure is defined in <time.h>. This is
basically just localtime, except that the ANSI function takes a
time_t which may not be what is returned by ixsysdep_time. */
extern void usysdep_localtime P((long itime, struct tm *q));
/* Sleep for a number of seconds. */
extern void usysdep_sleep P((int cseconds));
/* Pause for half a second, or 1 second if subsecond sleeps are not
possible. */
extern void usysdep_pause P((void));
/* Lock a remote system. This should return FALSE if the system is
already locked (no error should be reported). */
extern boolean fsysdep_lock_system P((const struct uuconf_system *qsys));
/* Unlock a remote system. This should return FALSE on error
(although the return value is generally ignored). */
extern boolean fsysdep_unlock_system P((const struct uuconf_system *qsys));
/* Get the conversation sequence number for a remote system, and
increment it for next time. This should return -1 on error. */
extern long ixsysdep_get_sequence P((const struct uuconf_system *qsys));
/* Get the status of a remote system. This should return FALSE on
error. Otherwise it should set *qret to the status. If no status
information is available, this should set *qret to sensible values
and return TRUE. If pfnone is not NULL, then it should be set to
TRUE if no status information was available or FALSE otherwise. */
extern boolean fsysdep_get_status P((const struct uuconf_system *qsys,
struct sstatus *qret,
boolean *pfnone));
/* Set the status of a remote system. This should return FALSE on
error. The system will be locked before this call is made. */
extern boolean fsysdep_set_status P((const struct uuconf_system *qsys,
const struct sstatus *qset));
/* See whether a remote system is permitted to log in. This is just
to support the remote.unknown shell script for HDB. The zscript
argument is the script name, as return by uuconf_remote_unknown.
The zsystem argument is the name given by the remote system. If
the system is not permitted to log in, this function should log an
error and return FALSE. */
extern boolean fsysdep_unknown_caller P((const char *zscript,
const char *zsystem));
/* Check whether there is work for a remote system. It should return
TRUE if there is work, FALSE otherwise; there is no way to indicate
an error. */
extern boolean fsysdep_has_work P((const struct uuconf_system *qsys));
/* Initialize the work scan. This will be called before
fsysdep_get_work. The bgrade argument is the minimum grade of
execution files that should be considered (e.g. a bgrade of 'd'
will allow all grades from 'A' to 'Z' and 'a' to 'd'). This
function should return FALSE on error. */
extern boolean fsysdep_get_work_init P((const struct uuconf_system *qsys,
int bgrade));
/* Get the next command to be executed for a remote system. The
bgrade argument will be the same as for fsysdep_get_work_init;
probably only one of these functions will use it, namely the
function for which it is more convenient. This should return FALSE
on error. The structure pointed to by qcmd should be filled in.
The strings may point into a static buffer; they will be copied out
if necessary. If there is no more work, this should set qcmd->bcmd
to 'H' and return TRUE. This should set qcmd->pseq to something
which can be passed to fsysdep_did_work to remove the job from the
queue when it has been completed. This may set qcmd->bcmd to 'P'
to represent a poll file; the main code will just pass the pseq
element of such a structure to fsysdep_did_work if the system is
called. */
extern boolean fsysdep_get_work P((const struct uuconf_system *qsys,
int bgrade, struct scmd *qcmd));
/* Remove a job from the work queue. This must also remove the
temporary file used for a send command, if there is one. It should
return FALSE on error. */
extern boolean fsysdep_did_work P((pointer pseq));
/* Save the temporary file for a send command. This function should
return a string that will be put into a mail message. On success
this string should say something like ``The file has been saved as
...''. On failure it could say something like ``The file could not
be saved because ...''. If there is no temporary file, or for some
reason it's not appropriate to include a message, this function
should just return NULL. This function is used when a file send
fails for some reason, to make sure that we don't completely lost
the file. */
extern const char *zsysdep_save_temp_file P((pointer pseq));
/* Save a file in a location used to hold corrupt files. This is
called if a bad execution file is found by uuxqt. This should
return the new name of the file (allocated by zbufalc), or NULL if
the move failed (in which the original file should remain). */
extern char *zsysdep_save_corrupt_file P((const char *zfile));
/* Save a file in a location used to hold failed execution files.
This is called if a uuxqt execution fails. This should return the
new name of the file (allocated by zbufalc), or NULL if the move
failed (in which case the original file should remain). */
extern char *zsysdep_save_failed_file P((const char *zfile));
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/* Cleanup anything left over by fsysdep_get_work_init and
fsysdep_get_work. This may be called even though
fsysdep_get_work_init has not been. */
extern void usysdep_get_work_free P((const struct uuconf_system *qsys));
/* Add a base name to a file if it is a directory. If zfile names a
directory, then return a string naming a file within the directory
with the base file name of zname. This should return NULL on
error. */
extern char *zsysdep_add_base P((const char *zfile,
const char *zname));
/* Get a file name from the spool directory. This should return NULL
on error. The pseq argument is TRUE if the file was found from
searching the work directory; this is, unfortunately, needed to
support SVR4 spool directories. */
extern char *zsysdep_spool_file_name P((const struct uuconf_system *qsys,
const char *zfile,
pointer pseq));
/* Make necessary directories. This should create all non-existent
directories for a file. If the fpublic argument is TRUE, anybody
should be permitted to create and remove files in the directory;
otherwise anybody can list the directory, but only the UUCP system
can create and remove files. It should return FALSE on error. */
extern boolean fsysdep_make_dirs P((const char *zfile, boolean fpublic));
/* Create a stdio file, setting appropriate protection. If the
fpublic argument is TRUE, the file is made publically accessible;
otherwise it is treated as a private data file. If the fappend
argument is TRUE, the file is opened in append mode; otherwise any
previously existing file of the same name is removed. If the
fmkdirs argument is TRUE, then any necessary directories should
also be created. On a system in which file protections are
unimportant and the necessary directories exist, this may be
implemented as
fopen (zfile, fappend ? "a" : "w");
*/
extern FILE *esysdep_fopen P((const char *zfile, boolean fpublic,
boolean fappend, boolean fmkdirs));
/* Open a file, using the access permission of the user who invoked
the program. The frd argument is TRUE if the file should be opened
for reading, and the fbinary argument is TRUE if the file should be
opened as a binary file (this is ignored on Unix, since there all
files are binary files). This returns an openfile_t, not a FILE *.
This is supposed to be able to open a file even if it can not be
read by the uucp user. This is not possible on some older Unix
systems. */
extern openfile_t esysdep_user_fopen P((const char *zfile,
boolean frd, boolean fbinary));
/* Open a file to send to another system; the qsys argument is the
system the file is being sent to. If fcheck is TRUE, it should
make sure that the file is readable by zuser (if zuser is NULL the
file must be readable by anybody). This is to eliminate a window
between fsysdep_in_directory and esysdep_open_send. If an error
occurs, it should return EFILECLOSED. */
extern openfile_t esysdep_open_send P((const struct uuconf_system *qsys,
const char *zname,
boolean fcheck,
const char *zuser));
/* Return a temporary file name to receive into. This file will be
opened by esysdep_open_receive. The qsys argument is the system
the file is coming from, the zto argument is the name the file will
have after it has been fully received, the ztemp argument, if it is
not NULL, is from the command sent by the remote system, and the
frestart argument is TRUE if the protocol and remote system permit
file transfers to be restarted. The return value must be freed
using ubuffree. The function should return NULL on error. */
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extern char *zsysdep_receive_temp P((const struct uuconf_system *qsys,
const char *zfile,
const char *ztemp,
boolean frestart));
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/* Open a file to receive from another system. The zreceive argument
is the return value of zsysdep_receive_temp with the same qsys,
zfile and ztemp arguments. If the function can determine that this
file has already been partially received, it should set *pcrestart
to the number of bytes that have been received. If the file has
not been partially received, *pcrestart should be set to -1.
pcrestart will be passed in as NULL if file restart is not
supported by the protocol or the remote system. The function
should return EFILECLOSED on error. After the file is written,
fsysdep_move_file will be called to move the file to its final
destination, and to set the correct file mode. */
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extern openfile_t esysdep_open_receive P((const struct uuconf_system *qsys,
const char *zto,
const char *ztemp,
const char *zreceive,
long *pcrestart));
/* Move a file. This is used to move a received file to its final
location. The zto argument is the file to create. The zorig
argument is the name of the file to move. If fmkdirs is TRUE, then
any necessary directories are created; fpublic indicates whether
they should be publically writeable or not. If fcheck is TRUE,
this should make sure the directory is writeable by the user zuser
(if zuser is NULL, then it must be writeable by any user); this is
to avoid a window of vulnerability between fsysdep_in_directory and
fsysdep_move_file. This function should return FALSE on error, in
which case the zorig file should still exist. */
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extern boolean fsysdep_move_file P((const char *zorig, const char *zto,
boolean fmkdirs, boolean fpublic,
boolean fcheck, const char *zuser));
/* Change the mode of a file. The imode argument is a Unix mode.
This should return FALSE on error. */
extern boolean fsysdep_change_mode P((const char *zfile,
unsigned int imode));
/* Truncate a file which we are receiving into. This may be done by
closing the original file, removing it and reopening it. This
should return FALSE on error. */
extern openfile_t esysdep_truncate P((openfile_t e, const char *zname));
/* Sync a file to disk. If this fails it should log an error using
the zmsg parameter, and return FALSE. This is controlled by the
FSYNC_ON_CLOSE macro in policy.h. */
extern boolean fsysdep_sync P((openfile_t e, const char *zmsg));
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/* It is possible for the acknowledgement of a received file to be
lost. The sending system will then now know that the file was
correctly received, and will send it again. This can be a problem
particularly with protocols which support channels, since they may
send several small files in a single window, all of which may be
received correctly although the sending system never sees the
acknowledgement. If these files involve an execution, the
execution will happen twice, which will be bad.
This function is called when a file is completely received. It is
supposed to try and remember the reception, in case the connection
is lost. It is passed the system, the file name to receive to, and
the temporary file name from the sending system. It should return
FALSE on error. */
extern boolean fsysdep_remember_reception P((const struct uuconf_system *qsys,
const char *zto,
const char *ztemp));
/* This function is called to see if a file has already been received
successfully. It gets the same arguments as
fsysdep_remember_reception. It should return TRUE if the file was
already received, FALSE otherwise. There is no way to report
error. */
extern boolean fsysdep_already_received P((const struct uuconf_system *qsys,
const char *zto,
const char *ztemp));
/* This function is called when it is no longer necessary to remember
that a file has been received. This will be called when the
protocol knows that the receive message has been acknowledged. It
gets the same arguments as fsysdep_remember_reception. it should
return FALSE on error. */
extern boolean fsysdep_forget_reception P((const struct uuconf_system *qsys,
const char *zto,
const char *ztemp));
/* Start expanding a wildcarded file name. This should return FALSE
on error; otherwise subsequent calls to zsysdep_wildcard should
return file names. */
extern boolean fsysdep_wildcard_start P((const char *zfile));
/* Get the next wildcard name. This should return NULL when there are
no more names to return. The return value should be freed using
ubuffree. The argument should be the same as that to
fsysdep_wildcard_start. There is no way to return error. */
extern char *zsysdep_wildcard P((const char *zfile));
/* Finish getting wildcard names. This may be called before or after
zsysdep_wildcard has returned NULL. It should return FALSE on
error. */
extern boolean fsysdep_wildcard_end P((void));
/* Prepare to execute a bunch of file transfer requests. This should
make an entry in the spool directory so that the next time uucico
is started up it will transfer these files. The bgrade argument
specifies the grade of the commands. The commands themselves are
in the pascmds array, which has ccmds entries. The function should
return NULL on error, or the jobid on success. The jobid is a
string that may be printed or passed to fsysdep_kill_job and
related functions, but is otherwise uninterpreted. */
extern char *zsysdep_spool_commands P((const struct uuconf_system *qsys,
int bgrade, int ccmds,
const struct scmd *pascmds));
/* Get a file name to use for a data file to be copied to another
system. The ztname, zdname and zxname arguments will all either be
NULL or point to an array of CFILE_NAME_LEN characters in length.
The ztname array should be set to a temporary file name that could
be passed to zsysdep_spool_file_name to retrieve the return value
of this function; this will be appropriate for the temporary name
in a send request. The zdname array should be set to a data file
name that is appropriate for the spool directory of the other
system; this will be appropriate for the name of the destination
file in a send request of a data file for an execution of some
sort. The zxname array should be set to an execute file name that
is appropriate for the other system. The zlocalname argument is
the name of the local system as seen by the remote system, the
bgrade argument is the grade, and fxqt is TRUE if this file is
going to become an execution file. This should return NULL on
error. */
#define CFILE_NAME_LEN (15)
extern char *zsysdep_data_file_name P((const struct uuconf_system *qsys,
const char *zlocalname,
int bgrade, boolean fxqt,
char *ztname, char *zdname,
char *zxname));
/* Get a name for a local execute file. This is used by uux for a
local command with remote files. Returns NULL on error. */
extern char *zsysdep_xqt_file_name P((void));
/* Beginning getting execute files. To get a list of execute files,
first fsysdep_get_xqt_init is called, then zsysdep_get_xqt is
called several times until it returns NULL, then finally
usysdep_get_xqt_free is called. If the zsystem argument is not
NULL, it is the name of a system for which execution files are
desired. */
extern boolean fsysdep_get_xqt_init P((const char *zsystem));
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/* Get the next execute file. This should return NULL when finished
(with *pferr set to FALSE). The zsystem argument should be the
same string as that passed to fsysdep_get_xqt_init. On an error
this should return NULL with *pferr set to TRUE. This should set
*pzsystem to the name of the system for which the execute file was
created; this is not guaranteed to match the zsystem argument--that
must be double checked by the caller. Both the return value and
*pzsystem should be freed using ubuffree. */
extern char *zsysdep_get_xqt P((const char *zsystem, char **pzsystem,
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boolean *pferr));
/* Clean up after getting execute files. The zsystem argument should
be the same string as that passed to fsysdep_get_xqt_init. */
extern void usysdep_get_xqt_free P((const char *zsystem));
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/* Get the absolute pathname of a command to execute. This is given
the legal list of commands (which may be the special case "ALL")
and the path. It must return an absolute pathname to the command.
If it gets an error it should set *pferr to TRUE and return NULL;
if the command is not found it should set *pferr to FALSE and
return NULL. */
extern char *zsysdep_find_command P((const char *zcmd, char **pzcmds,
char **pzpath, boolean *pferr));
/* Expand file names for uuxqt. This exists because uuxqt on Unix has
to expand file names which begin with a ~. It does not want to
expand any other type of file name, and it turns a double ~ into a
single one without expanding. If this returns NULL, the file does
not need to be changed; otherwise it returns a zbufalc'ed string.
There is no way to report error. */
extern char *zsysdep_xqt_local_file P((const struct uuconf_system *qsys,
const char *zfile));
#if ! ALLOW_FILENAME_ARGUMENTS
/* Check an argument to an execution command to make sure that it
doesn't refer to a file name that may not be accessed. This should
check the argument to see if it is a filename. If it is, it should
either reject it out of hand or it should call fin_directory_list
on the file with both qsys->zremote_receive and qsys->zremote_send.
If the file is rejected, it should log an error and return FALSE.
Otherwise it should return TRUE. */
extern boolean fsysdep_xqt_check_file P((const struct uuconf_system *qsys,
const char *zfile));
#endif /* ! ALLOW_FILENAME_ARGUMENTS */
/* Run an execute file. The arguments are:
qsys -- system for which execute file was created
zuser -- user who requested execution
pazargs -- list of arguments to command (element 0 is command)
zfullcmd -- command and arguments stuck together in one string
zinput -- file name for standard input (may be NULL)
zoutput -- file name for standard output (may be NULL)
fshell -- if TRUE, use /bin/sh to execute file
ilock -- return value of ixsysdep_lock_uuxqt
pzerror -- set to name of standard error file
pftemp -- set to TRUE if error is temporary, FALSE otherwise
If fshell is TRUE, the command should be executed with /bin/sh
(obviously, this can only really be done on Unix systems). If an
error occurs this should return FALSE and set *pftemp
appropriately. *pzerror should be freed using ubuffree. */
extern boolean fsysdep_execute P((const struct uuconf_system *qsys,
const char *zuser,
const char **pazargs,
const char *zfullcmd,
const char *zinput,
const char *zoutput,
boolean fshell,
int ilock,
char **pzerror,
boolean *pftemp));
/* Lock for uuxqt execution. If the cmaxuuxqts argument is not zero,
this should make sure that no more than cmaxuuxqts uuxqt processes
are running at once. Also, only one uuxqt may execute a particular
command (specified by the -c option) at a time. If zcmd is not
NULL, it is a command that must be locked. This should return a
nonnegative number which will be passed to other routines,
including fsysdep_unlock_uuxqt, or -1 on error. */
extern int ixsysdep_lock_uuxqt P((const char *zcmd,
int cmaxuuxqts));
/* Unlock a uuxqt process. This is passed the return value of
ixsysdep_lock_uuxqt, as well as the arguments passed to
ixsysdep_lock_uuxqt. It may return FALSE on error, but at present
the return value is ignored. */
extern boolean fsysdep_unlock_uuxqt P((int iseq, const char *zcmd,
int cmaxuuxqts));
/* See whether a particular uuxqt command is locked. This should
return TRUE if the command is locked (because ixsysdep_lock_uuxqt
was called with it as an argument), FALSE otherwise. There is no
way to return error. */
extern boolean fsysdep_uuxqt_locked P((const char *zcmd));
/* Lock an execute file in order to execute it. This should return
FALSE if the execute file is already locked. There is no way to
return error. */
extern boolean fsysdep_lock_uuxqt_file P((const char *zfile));
/* Unlock an execute file. This should return FALSE on error. */
extern boolean fsysdep_unlock_uuxqt_file P((const char *zfile));
/* Lock the execution directory. The ilock argument is the return
value of ixsysdep_lock_uuxqt. This should return FALSE if the
directory is already locked. There is no way to return error. */
extern boolean fsysdep_lock_uuxqt_dir P((int ilock));
/* Remove all files in the execution directory, and unlock it. This
should return FALSE on error. */
extern boolean fsysdep_unlock_uuxqt_dir P((int ilock));
/* Move files into or out of the execution directory. The code will
already have checked that all the files exist. The elements in the
pzfrom array will be complete filenames, and the elements in the
pzto array will be either NULL (in which case the file should not
be moved) or simple base names. If fto is TRUE, the files in
pzfrom should be moved to pzto; otherwise, the files in pzto should
be moved to pzfrom (this is used if a temporary failure occurs, in
which case the execution will be retried later). If pzinput and
*pzinput are not NULL, then it is the name of the standard input
file; if it is the same as any element of pzfrom, then *pzinput
should be set to the zbufcpy of the corresponding pzto value, if
any. */
extern boolean fsysdep_move_uuxqt_files P((int cfiles,
const char *const *pzfrom,
const char *const *pzto,
boolean fto, int ilock,
char **pzinput));
/* Expand a file name on the local system, defaulting to the current
directory. This is just like zsysdep_local_file, except that
relative files are placed in the working directory the program
started in rather than in the public directory. This should return
NULL on error. */
extern char *zsysdep_local_file_cwd P((const char *zname,
const char *zpubdir,
boolean *pfbadname));
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/* Add the working directory to a file name. The named file is
actually on a remote system. If the file already has a directory,
it should not be changed. This should return NULL on error. */
extern char *zsysdep_add_cwd P((const char *zfile));
/* See whether a file name will need the current working directory
when zsysdep_local_file_cwd or zsysdep_add_cwd is called on it.
This will be called before usysdep_initialize. It should just
check whether the argument is an absolute path. See the comment
above usysdep_initialize in this file for an explanation of why
things are done this way. */
extern boolean fsysdep_needs_cwd P((const char *zfile));
/* Get the base name of a file. The file will be a local file name,
and this function should return the base file name, ideally in a
form which will make sense on most systems; it will be used if the
destination of a uucp is a directory. */
extern char *zsysdep_base_name P((const char *zfile));
/* Return a filename within a directory. */
extern char *zsysdep_in_dir P((const char *zdir, const char *zfile));
/* Get the mode of a file. This should return a Unix style file mode.
It should return 0 on error. */
extern unsigned int ixsysdep_file_mode P((const char *zfile));
/* See whether the user has access to a file. This is called by uucp
and uux to prevent copying of a file which uucp can read but the
user cannot. If access is denied, this should log an error message
and return FALSE. */
extern boolean fsysdep_access P((const char *zfile));
/* See whether the daemon has access to a file. This is called by
uucp and uux when a file is queued up for transfer without being
copied into the spool directory. It is merely an early error
check, as the daemon would of course discover the error itself when
it tried the transfer. If access would be denied, this should log
an error message and return FALSE. */
extern boolean fsysdep_daemon_access P((const char *zfile));
/* Translate a destination from system!user to a place in the public
directory where uupick will get the file. On Unix this produces
system!~/receive/user/localname, and that's probably what it has to
produce on any other system as well. Returns NULL on a usage
error, or otherwise returns string allocated by zbufcpy. */
extern char *zsysdep_uuto P((const char *zdest,
const char *zlocalname));
/* Return TRUE if a pathname exists and is a directory. */
extern boolean fsysdep_directory P((const char *zpath));
/* Walk a directory tree. The zdir argument is the directory to walk.
The pufn argument is a function to call on each regular file in the
tree. The first argument to pufn should be the full filename; the
second argument to pufn should be the filename relative to zdir;
the third argument to pufn should be the pinfo argument to
usysdep_walk_tree. The usysdep_walk_tree function should return
FALSE on error. */
extern boolean usysdep_walk_tree P((const char *zdir,
void (*pufn) P((const char *zfull,
const char *zrelative,
pointer pinfo)),
pointer pinfo));
/* Return the jobid of a work file, given the sequence value. On
error this should log an error and return NULL. The jobid is a
string which may be printed out and read in and passed to
fsysdep_kill_job, etc., but is not otherwise interpreted. */
extern char *zsysdep_jobid P((const struct uuconf_system *qsys,
pointer pseq));
/* See whether the current user is privileged. Privileged users are
permitted to kill jobs submitted by another user, and they are
permitted to use the -u argument to uucico; other uses of this call
may be added later. This should return TRUE if permission is
granted, FALSE otherwise. */
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extern boolean fsysdep_privileged P((void));
/* Kill a job, given the jobid. This should remove all associated
files and in general eliminate the job completely. On error it
should log an error message and return FALSE. */
extern boolean fsysdep_kill_job P((pointer puuconf,
const char *zjobid));
/* Rejuvenate a job, given the jobid. If possible, this should update
the time associated with the job such that it will not be
eliminated by uustat -K or similar programs that check the creation
time. This should affect the return value of ixsysdep_work_time.
On error it should log an error message and return FALSE. */
extern boolean fsysdep_rejuvenate_job P((pointer puuconf,
const char *zjobid));
/* Get the time a job was queued, given the sequence number. There is
no way to indicate error. The return value must use the same epoch
as ixsysdep_time. */
extern long ixsysdep_work_time P((const struct uuconf_system *qsys,
pointer pseq));
/* Get the time a file was created. This is called by uustat on
execution files. There is no way to indicate error. The return
value must use the same epoch as ixsysdep_time. */
extern long ixsysdep_file_time P((const char *zfile));
/* Touch a file to make it appear as though it was created at the
current time. This is called by uustat on execution files. On
error this should log an error message and return FALSE. */
extern boolean fsysdep_touch_file P((const char *zfile));
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/* Get the size in bytes of a file. If this file does not exist, this
should not give an error message, but should return -1. If some
other error occurs, this should return -2. */
extern long csysdep_size P((const char *zfile));
/* Return the amount of free space on the containing the given file
name (the file may or may not exist). If the amount of free space
cannot be determined, the function should return -1. */
extern long csysdep_bytes_free P((const char *zfile));
/* Start getting status information for all systems with available
status information. There may be status information for unknown
systems, which is why this series of functions is used. The phold
argument is used to pass information around, to possibly avoid the
use of static variables. On error this should log an error and
return FALSE. */
extern boolean fsysdep_all_status_init P((pointer *phold));
/* Get status information for the next system. This should return the
system name and fill in the qstat argument. The phold argument
will be that set by fsysdep_all_status_init. On error this should
log an error, set *pferr to TRUE, and return NULL. */
extern char *zsysdep_all_status P((pointer phold, boolean *pferr,
struct sstatus *qstat));
/* Free up anything allocated by fsysdep_all_status_init and
zsysdep_all_status. The phold argument is that set by
fsysdep_all_status_init. */
extern void usysdep_all_status_free P((pointer phold));
/* Display the process status of all processes holding lock files.
This is uustat -p. The return value is passed to usysdep_exit. */
extern boolean fsysdep_lock_status P((void));
/* Return TRUE if the user has legitimate access to the port. This is
used by cu to control whether the user can open a port directly,
rather than merely being able to dial out on it. Opening a port
directly allows the modem to be reprogrammed. */
extern boolean fsysdep_port_access P((struct uuconf_port *qport));
/* Return whether the given port could be named by the given line. On
Unix, the line argument would be something like "ttyd0", and this
function should return TRUE if the named port is "/dev/ttyd0". */
extern boolean fsysdep_port_is_line P((struct uuconf_port *qport,
const char *zline));
/* Set the terminal into raw mode. In this mode no input characters
should be treated specially, and characters should be made
available as they are typed. The original terminal mode should be
saved, so that it can be restored by fsysdep_terminal_restore. If
flocalecho is TRUE, then local echoing should still be done;
otherwise echoing should be disabled. This function returns FALSE
on error. */
extern boolean fsysdep_terminal_raw P((boolean flocalecho));
/* Restore the terminal back to the original setting, before
fsysdep_terminal_raw was called. Returns FALSE on error. */
extern boolean fsysdep_terminal_restore P((void));
/* Read a line from the terminal. The fsysdep_terminal_raw function
will have been called. This should print the zprompt argument
(unless it is NULL) and return the line, allocated by zbufcpy, or
NULL on error. */
extern char *zsysdep_terminal_line P((const char *zprompt));
/* Write a line to the terminal, ending with a newline. This is
basically just puts (zline, stdout), except that the terminal will
be in raw mode, so on ASCII Unix systems the line needs to end with
\r\n. */
extern boolean fsysdep_terminal_puts P((const char *zline));
/* If faccept is TRUE, permit the user to generate signals from the
terminal. If faccept is FALSE, turn signals off again. After
fsysdep_terminal_raw is called, signals should be off. Return
FALSE on error. */
extern boolean fsysdep_terminal_signals P((boolean faccept));
/* The cu program expects the system dependent code to handle the
details of copying data from the communications port to the
terminal. This should be set up by fsysdep_cu_init, and done while
fsysdep_cu is called. It is permissible to do it on a continual
basis (on Unix a subprocess handles it) so long as the copying can
be stopped by the fsysdep_cu_copy function.
The fsysdep_cu_init function does any system dependent
initialization needed for this. */
extern boolean fsysdep_cu_init P((struct sconnection *qconn));
/* Copy all data from the communications port to the terminal, and all
data from the terminal to the communications port. Keep this up
until the escape character *zCuvar_escape is seen. Set *pbcmd to
the character following the escape character; after the escape
character, zlocalname should be printed, possibly after a delay.
If two escape characters are entered in sequence, this function
should send a single escape character to the port, and not return.
Returns FALSE on error. */
extern boolean fsysdep_cu P((struct sconnection *qconn,
char *pbcmd,
const char *zlocalname));
/* If fcopy is TRUE, start copying data from the communications port
to the terminal. If fcopy is FALSE, stop copying data. This
function may be called several times during a cu session. It
should return FALSE on error. */
extern boolean fsysdep_cu_copy P((boolean fcopy));
/* Stop copying data from the communications port to the terminal, and
generally clean up after fsysdep_cu_init and fsysdep_cu. Returns
FALSE on error. */
extern boolean fsysdep_cu_finish P((void));
/* Run a shell command. If zcmd is NULL, or *zcmd == '\0', just
start up a shell. The second argument is one of the following
values. This should return FALSE on error. */
enum tshell_cmd
{
/* Attach stdin and stdout to the terminal. */
SHELL_NORMAL,
/* Attach stdout to the communications port, stdin to the terminal. */
SHELL_STDOUT_TO_PORT,
/* Attach stdin to the communications port, stdout to the terminal. */
SHELL_STDIN_FROM_PORT,
/* Attach both stdin and stdout to the communications port. */
SHELL_STDIO_ON_PORT
};
extern boolean fsysdep_shell P((struct sconnection *qconn,
const char *zcmd,
enum tshell_cmd tcmd));
/* Change directory. If zdir is NULL, or *zdir == '\0', change to the
user's home directory. Return FALSE on error. */
extern boolean fsysdep_chdir P((const char *zdir));
/* Suspend the current process. This is only expected to work on Unix
versions that support SIGTSTP. In general, people can just shell
out. */
extern boolean fsysdep_suspend P((void));
/* Start getting files for uupick. The zsystem argument may be NULL
to get files from all systems, or it may specify a particular
system. The zpubdir argument is the public directory to use. This
returns FALSE on error. */
extern boolean fsysdep_uupick_init P((const char *zsystem,
const char *zpubdir));
/* Get the next file for uupick. This returns the basic file name.
It sets *pzfull to the full name, and *pzfrom to the name of the
system which sent this file over; both should be freed using
ubuffree. *pzfull should be passed to ubuffree after it is no
longer needed. The zsystem and zpubdir arguments should be the
same as the arguments to fsysdep_uupick_init. This returns NULL
when all files been returned. */
extern char *zsysdep_uupick P((const char *zsystem, const char *zpubdir,
char **pzfrom, char **pzfull));
/* Clean up after getting files for uupick. */
extern boolean fsysdep_uupick_free P((const char *zsystem,
const char *zpubdir));
/* Translate a local file name for uupick. On Unix this is just like
zsysdep_local_file_cwd except that a file beginning with ~/ is
placed in the user's home directory rather than in the public
directory. */
extern char *zsysdep_uupick_local_file P((const char *zfile,
boolean *pfbadname));
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/* Remove a directory and all the files in it. */
extern boolean fsysdep_rmdir P((const char *zdir));
#endif /* ! defined (SYSTEM_H) */