mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-18 12:52:37 +03:00
86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
|
|
FUNCTION
|
|
<<system>>---execute command string
|
|
|
|
INDEX
|
|
system
|
|
INDEX
|
|
_system_r
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <stdlib.h>
|
|
int system(char *<[s]>);
|
|
|
|
int _system_r(void *<[reent]>, char *<[s]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <stdlib.h>
|
|
int system(<[s]>)
|
|
char *<[s]>;
|
|
|
|
int _system_r(<[reent]>, <[s]>)
|
|
char *<[reent]>;
|
|
char *<[s]>;
|
|
|
|
DESCRIPTION
|
|
|
|
Use <<system>> to pass a command string <<*<[s]>>> to <</bin/sh>> on
|
|
your system, and wait for it to finish executing.
|
|
|
|
Use ``<<system(NULL)>>'' to test whether your system has <</bin/sh>>
|
|
available.
|
|
|
|
The alternate function <<_system_r>> is a reentrant version. The
|
|
extra argument <[reent]> is a pointer to a reentrancy structure.
|
|
|
|
RETURNS
|
|
<<system(NULL)>> returns a non-zero value if <</bin/sh>> is available, and
|
|
<<0>> if it is not.
|
|
|
|
With a command argument, the result of <<system>> is the exit status
|
|
returned by <</bin/sh>>.
|
|
|
|
PORTABILITY
|
|
ANSI C requires <<system>>, but leaves the nature and effects of a
|
|
command processor undefined. ANSI C does, however, specify that
|
|
<<system(NULL)>> return zero or nonzero to report on the existence of
|
|
a command processor.
|
|
|
|
POSIX.2 requires <<system>>, and requires that it invoke a <<sh>>.
|
|
Where <<sh>> is found is left unspecified.
|
|
|
|
Supporting OS subroutines required: <<_exit>>, <<_execve>>, <<_fork_r>>,
|
|
<<_wait_r>>.
|
|
*/
|
|
|
|
#include <_ansi.h>
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <_syslist.h>
|
|
#include <reent.h>
|
|
|
|
|
|
int
|
|
_DEFUN(_system_r, (ptr, s),
|
|
struct _reent *ptr _AND
|
|
_CONST char *s)
|
|
{
|
|
if (s == NULL)
|
|
return 0;
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
int
|
|
_DEFUN(system, (s),
|
|
_CONST char *s)
|
|
{
|
|
return _system_r (_REENT, s);
|
|
}
|
|
|
|
#endif
|