From: Magnus Hagander <mha@sollentuna.net>
Here's another patch for the libpq backend areas. This patch removes all usage of "FILE *" on the communications channel. It also cleans up the comments and headers in the pqcomm.c file - a lot of things were either missing or incorrect. Finally, it removes a couple of unused functions (leftovers from the time of shared code between the libpq backend and frontend).
This commit is contained in:
Marc G. Fournier
parent
3b3ffc8d97
commit
d8b96ade81
@ -5,19 +5,22 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pqcomm.c,v 1.60 1999/01/11 03:56:06 scrappy Exp $
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* $Id: pqcomm.c,v 1.61 1999/01/12 12:49:51 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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/*
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* INTERFACE ROUTINES
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* pq_gettty - return the name of the tty in the given buffer
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* pq_init - initialize libpq
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* pq_getport - return the PGPORT setting
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* pq_close - close input / output connections
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* pq_flush - flush pending output
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* pq_getstr - get a null terminated string from connection
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* pq_getnchar - get n characters from connection
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* pq_getchar - get 1 character from connection
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* pq_peekchar - peek at first character in connection
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* pq_getnchar - get n characters from connection, and null-terminate
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* pq_getint - get an integer from connection
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* pq_putchar - send 1 character to connection
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* pq_putstr - send a null terminated string to connection
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* pq_putnchar - send n characters to connection
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* pq_putint - send an integer to connection
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@ -26,12 +29,15 @@
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* the length)
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* pq_getinaddr - initialize address from host and port number
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* pq_getinserv - initialize address from host and service name
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* pq_connect - create remote input / output connection
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* pq_accept - accept remote input / output connection
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*
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* StreamDoUnlink - Shutdown UNIX socket connectioin
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* StreamServerPort - Open sock stream
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* StreamConnection - Create new connection with client
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* StreamClose - Close a client/backend connection
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*
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* NOTES
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* These functions are used by both frontend applications and
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* the postgres backend.
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* Frontend is now completey in interfaces/libpq, and no
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* functions from this file is used.
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*
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*/
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#include "postgres.h"
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@ -71,13 +77,7 @@
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#endif
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#include "utils/trace.h"
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/* ----------------
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* declarations
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* ----------------
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*/
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static FILE *Pfout,
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*Pfin,
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*Pfdebug; /* debugging libpq */
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extern FILE * debug_port; /* in util.c */
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/* --------------------------------
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* pq_init - open portal file descriptors
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@ -86,15 +86,9 @@ static FILE *Pfout,
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void
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pq_init(int fd)
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{
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Pfin = fdopen(fd, "r");
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Pfout = fdopen(dup(fd), "w");
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if (!Pfin || !Pfout)
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elog(FATAL, "pq_init: Couldn't initialize socket connection");
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PQnotifies_init();
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if (getenv("LIBPQ_DEBUG"))
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Pfdebug = stderr;
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else
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Pfdebug = NULL;
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debug_port = stderr;
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}
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/* -------------------------
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@ -102,19 +96,23 @@ pq_init(int fd)
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*
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* get a character from the input file,
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*
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* if Pfdebug is set, also echo the character fetched into Pfdebug
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*
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* used for debugging libpq
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*/
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int
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pq_getchar(void)
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{
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int c;
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char c;
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char isDone = 0;
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c = getc(Pfin);
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if (Pfdebug && c != EOF)
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putc(c, Pfdebug);
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do {
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if (recv(MyProcPort->sock,&c,1,MSG_WAITALL) != 1) {
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if (errno != EINTR)
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return EOF; /* Not interrupted, so something went wrong */
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}
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else
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isDone = 1;
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} while (!isDone);
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return c;
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}
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@ -124,23 +122,23 @@ pq_getchar(void)
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*/
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int
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pq_peekchar(void) {
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char c = getc(Pfin);
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ungetc(c,Pfin);
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return c;
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char c;
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char isDone = 0;
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do {
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if (recv(MyProcPort->sock,&c,1,MSG_WAITALL | MSG_PEEK) != 1) {
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if (errno != EINTR)
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return EOF; /* Not interrupted, so something went wrong */
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}
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else
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isDone = 1;
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} while (!isDone);
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return c;
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}
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/* --------------------------------
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* pq_gettty - return the name of the tty in the given buffer
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* --------------------------------
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*/
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void
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pq_gettty(char *tp)
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{
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strncpy(tp, ttyname(0), 19);
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}
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/* --------------------------------
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* pq_getport - return the PGPORT setting
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* --------------------------------
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@ -162,16 +160,7 @@ pq_getport()
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void
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pq_close()
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{
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if (Pfin)
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{
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fclose(Pfin);
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Pfin = NULL;
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}
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if (Pfout)
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{
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fclose(Pfout);
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Pfout = NULL;
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}
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close(MyProcPort->sock);
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PQnotifies_init();
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}
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@ -182,8 +171,7 @@ pq_close()
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void
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pq_flush()
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{
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if (Pfout)
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fflush(Pfout);
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/* Not supported/required? */
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}
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/* --------------------------------
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@ -198,13 +186,7 @@ pq_getstr(char *s, int maxlen)
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char *p;
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#endif
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if (Pfin == (FILE *) NULL)
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{
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/* elog(DEBUG, "Input descriptor is null"); */
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return EOF;
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}
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c = pqGetString(s, maxlen, Pfin);
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c = pqGetString(s, maxlen);
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#ifdef MULTIBYTE
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p = (char*) pg_client_to_server((unsigned char *) s, maxlen);
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@ -215,73 +197,16 @@ pq_getstr(char *s, int maxlen)
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return c;
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}
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/*
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* USER FUNCTION - gets a newline-terminated string from the backend.
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*
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* Chiefly here so that applications can use "COPY <rel> to stdout"
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* and read the output string. Returns a null-terminated string in s.
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*
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* PQgetline reads up to maxlen-1 characters (like fgets(3)) but strips
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* the terminating \n (like gets(3)).
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*
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* RETURNS:
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* EOF if it is detected or invalid arguments are given
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* 0 if EOL is reached (i.e., \n has been read)
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* (this is required for backward-compatibility -- this
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* routine used to always return EOF or 0, assuming that
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* the line ended within maxlen bytes.)
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* 1 in other cases
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*/
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int
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PQgetline(char *s, int maxlen)
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{
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if (!Pfin || !s || maxlen <= 1)
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return EOF;
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if (fgets(s, maxlen - 1, Pfin) == NULL)
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return feof(Pfin) ? EOF : 1;
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else
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{
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for (; *s; s++)
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{
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if (*s == '\n')
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{
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*s = '\0';
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break;
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}
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}
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}
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return 0;
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}
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/*
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* USER FUNCTION - sends a string to the backend.
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*
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* Chiefly here so that applications can use "COPY <rel> from stdin".
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*
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* RETURNS:
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* 0 in all cases.
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*/
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int
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PQputline(char *s)
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{
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if (Pfout)
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{
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fputs(s, Pfout);
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fflush(Pfout);
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}
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return 0;
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}
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/* --------------------------------
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* pq_getnchar - get n characters from connection
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* pq_getnchar - get n characters from connection, and null terminate
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* --------------------------------
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*/
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int
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pq_getnchar(char *s, int off, int maxlen)
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{
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return pqGetNBytes(s + off, maxlen, Pfin);
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int r = pqGetNBytes(s + off, maxlen);
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s[off+maxlen] = '\0';
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return r;
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}
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/* --------------------------------
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@ -297,9 +222,6 @@ pq_getint(int b)
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int n,
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status = 1;
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if (!Pfin)
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return EOF;
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/*
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* mjl: Seems inconsisten w/ return value of pq_putint (void). Also,
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* EOF is a valid return value for an int! XXX
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@ -308,13 +230,13 @@ pq_getint(int b)
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switch (b)
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{
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case 1:
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status = ((n = fgetc(Pfin)) == EOF);
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status = ((n = pq_getchar()) == EOF);
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break;
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case 2:
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status = pqGetShort(&n, Pfin);
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status = pqGetShort(&n);
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break;
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case 4:
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status = pqGetLong(&n, Pfin);
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status = pqGetLong(&n);
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break;
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default:
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fprintf(stderr, "** Unsupported size %d\n", b);
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@ -343,9 +265,9 @@ pq_putstr(char *s)
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unsigned char *p;
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p = pg_server_to_client(s, strlen(s));
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if (pqPutString(p, Pfout))
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if (pqPutString(p))
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#else
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if (pqPutString(s, Pfout))
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if (pqPutString(s))
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#endif
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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@ -362,10 +284,10 @@ pq_putstr(char *s)
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void
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pq_putnchar(char *s, int n)
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{
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if (pqPutNBytes(s, n, Pfout))
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if (pqPutNBytes(s, n))
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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"FATAL: pq_putnchar: fputc() failed: errno=%d\n",
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"FATAL: pq_putnchar: pqPutNBytes() failed: errno=%d\n",
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errno);
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fputs(PQerrormsg, stderr);
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pqdebug("%s", PQerrormsg);
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@ -384,20 +306,17 @@ pq_putint(int i, int b)
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{
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int status;
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if (!Pfout)
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return;
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status = 1;
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switch (b)
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{
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case 1:
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status = (fputc(i, Pfout) == EOF);
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status = (pq_putchar(i) == EOF);
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break;
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case 2:
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status = pqPutShort(i, Pfout);
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status = pqPutShort(i);
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break;
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case 4:
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status = pqPutLong(i, Pfout);
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status = pqPutLong(i);
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break;
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default:
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fprintf(stderr, "** Unsupported size %d\n", b);
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@ -485,6 +404,19 @@ pq_getinserv(struct sockaddr_in * sin, char *host, char *serv)
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* Stream functions are used for vanilla TCP connection protocol.
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*/
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static char sock_path[MAXPGPATH + 1] = "";
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/* StreamDoUnlink()
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* Shutdown routine for backend connection
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* If a Unix socket is used for communication, explicitly close it.
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*/
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void
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StreamDoUnlink()
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{
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Assert(sock_path[0]);
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unlink(sock_path);
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}
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/*
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* StreamServerPort -- open a sock stream "listening" port.
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*
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@ -498,19 +430,6 @@ pq_getinserv(struct sockaddr_in * sin, char *host, char *serv)
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* RETURNS: STATUS_OK or STATUS_ERROR
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*/
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static char sock_path[MAXPGPATH + 1] = "";
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/* do_unlink()
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* Shutdown routine for backend connection
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* If a Unix socket is used for communication, explicitly close it.
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*/
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void
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StreamDoUnlink()
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{
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Assert(sock_path[0]);
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unlink(sock_path);
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}
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int
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StreamServerPort(char *hostName, short portName, int *fdP)
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{
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@ -707,81 +626,6 @@ StreamClose(int sock)
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close(sock);
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}
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/* ---------------------------
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* StreamOpen -- From client, initiate a connection with the
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* server (Postmaster).
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*
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* RETURNS: STATUS_OK or STATUS_ERROR
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*
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* NOTE: connection is NOT established just because this
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* routine exits. Local state is ok, but we haven't
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* spoken to the postmaster yet.
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* ---------------------------
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*/
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int
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StreamOpen(char *hostName, short portName, Port *port)
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{
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SOCKET_SIZE_TYPE len;
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int err;
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struct hostent *hp;
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extern int errno;
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/* set up the server (remote) address */
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MemSet((char *) &port->raddr, 0, sizeof(port->raddr));
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if (hostName)
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{
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if (!(hp = gethostbyname(hostName)) || hp->h_addrtype != AF_INET)
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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"FATAL: StreamOpen: unknown hostname: %s\n", hostName);
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fputs(PQerrormsg, stderr);
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pqdebug("%s", PQerrormsg);
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return STATUS_ERROR;
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}
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memmove((char *) &(port->raddr.in.sin_addr),
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(char *) hp->h_addr,
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hp->h_length);
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port->raddr.in.sin_family = AF_INET;
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port->raddr.in.sin_port = htons(portName);
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len = sizeof(struct sockaddr_in);
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}
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else
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{
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port->raddr.un.sun_family = AF_UNIX;
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len = UNIXSOCK_PATH(port->raddr.un, portName);
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}
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/* connect to the server */
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if ((port->sock = socket(port->raddr.sa.sa_family, SOCK_STREAM, 0)) < 0)
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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"FATAL: StreamOpen: socket() failed: errno=%d\n", errno);
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fputs(PQerrormsg, stderr);
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pqdebug("%s", PQerrormsg);
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return STATUS_ERROR;
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}
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err = connect(port->sock, &port->raddr.sa, len);
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if (err < 0)
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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"FATAL: StreamOpen: connect() failed: errno=%d\n", errno);
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fputs(PQerrormsg, stderr);
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pqdebug("%s", PQerrormsg);
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return STATUS_ERROR;
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}
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/* fill in the client address */
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if (getsockname(port->sock, &port->laddr.sa, &len) < 0)
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{
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snprintf(PQerrormsg, ERROR_MSG_LENGTH,
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"FATAL: StreamOpen: getsockname() failed: errno=%d\n", errno);
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fputs(PQerrormsg, stderr);
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pqdebug("%s", PQerrormsg);
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return STATUS_ERROR;
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}
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return STATUS_OK;
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}
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#ifdef MULTIBYTE
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void
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pq_putncharlen(char *s, int n)
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@ -798,3 +642,24 @@ pq_putncharlen(char *s, int n)
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#endif
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/*
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* Act like the stdio putc() function. Write one character
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* to the stream. Return this character, or EOF on error.
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*/
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int pq_putchar(char c)
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{
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char isDone = 0;
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do {
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if (send(MyProcPort->sock, &c, 1, 0) != 1) {
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if (errno != EINTR)
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return EOF; /* Anything other than interrupt is error! */
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}
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else
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isDone = 1; /* Done if we sent one char */
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} while (!isDone);
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return c;
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}
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@ -4,7 +4,9 @@
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#include <netinet/in.h>
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#include "postgres.h"
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#include "miscadmin.h"
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#include "libpq/pqcomm.h"
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#include "libpq/libpq.h"
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/*
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@ -69,7 +71,7 @@
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/* --------------------------------------------------------------------- */
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int
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pqPutShort(int integer, FILE *f)
|
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pqPutShort(int integer)
|
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{
|
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uint16 n;
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@ -79,15 +81,12 @@ pqPutShort(int integer, FILE *f)
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n = ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? hton_s(integer) : htons((uint16) integer));
|
||||
#endif
|
||||
|
||||
if (fwrite(&n, 2, 1, f) != 1)
|
||||
return EOF;
|
||||
|
||||
return 0;
|
||||
return pqPutNBytes((char *)&n, 2); /* 0 on success, EOF otherwise */
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqPutLong(int integer, FILE *f)
|
||||
pqPutLong(int integer)
|
||||
{
|
||||
uint32 n;
|
||||
|
||||
@ -97,20 +96,17 @@ pqPutLong(int integer, FILE *f)
|
||||
n = ((PG_PROTOCOL_MAJOR(FrontendProtocol) == 0) ? hton_l(integer) : htonl((uint32) integer));
|
||||
#endif
|
||||
|
||||
if (fwrite(&n, 4, 1, f) != 1)
|
||||
return EOF;
|
||||
|
||||
return 0;
|
||||
return pqPutNBytes((char *)&n,4);
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqGetShort(int *result, FILE *f)
|
||||
pqGetShort(int *result)
|
||||
{
|
||||
uint16 n;
|
||||
|
||||
if (fread(&n, 2, 1, f) != 1)
|
||||
return EOF;
|
||||
if (pqGetNBytes((char *)&n,2) != 0)
|
||||
return EOF;
|
||||
|
||||
#ifdef FRONTEND
|
||||
*result = (int) ntohs(n);
|
||||
@ -123,12 +119,12 @@ pqGetShort(int *result, FILE *f)
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqGetLong(int *result, FILE *f)
|
||||
pqGetLong(int *result)
|
||||
{
|
||||
uint32 n;
|
||||
|
||||
if (fread(&n, 4, 1, f) != 1)
|
||||
return EOF;
|
||||
if (pqGetNBytes((char *)&n, 4) != 0)
|
||||
return EOF;
|
||||
|
||||
#ifdef FRONTEND
|
||||
*result = (int) ntohl(n);
|
||||
@ -145,47 +141,59 @@ pqGetLong(int *result, FILE *f)
|
||||
Return 0 if ok.
|
||||
*/
|
||||
int
|
||||
pqGetNBytes(char *s, size_t len, FILE *f)
|
||||
pqGetNBytes(char *s, size_t len)
|
||||
{
|
||||
int cnt;
|
||||
int bytesDone = 0;
|
||||
|
||||
if (f == NULL)
|
||||
return EOF;
|
||||
do {
|
||||
int r = recv(MyProcPort->sock, s+bytesDone, len-bytesDone, MSG_WAITALL);
|
||||
if (r == 0 || r == -1) {
|
||||
if (errno != EINTR)
|
||||
return EOF; /* All other than signal-interrupted is error */
|
||||
continue; /* Otherwise, try again */
|
||||
}
|
||||
|
||||
/* r contains number of bytes received */
|
||||
bytesDone += r;
|
||||
|
||||
cnt = fread(s, 1, len, f);
|
||||
s[cnt] = '\0';
|
||||
|
||||
return (cnt == len) ? 0 : EOF;
|
||||
} while (bytesDone < len);
|
||||
/* Zero-termination now in pq_getnchar() instead */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqPutNBytes(const char *s, size_t len, FILE *f)
|
||||
pqPutNBytes(const char *s, size_t len)
|
||||
{
|
||||
if (f == NULL)
|
||||
return EOF;
|
||||
int bytesDone = 0;
|
||||
|
||||
if (fwrite(s, 1, len, f) != len)
|
||||
return EOF;
|
||||
do {
|
||||
int r = send(MyProcPort->sock, s+bytesDone, len-bytesDone, 0);
|
||||
if (r == 0 || r == -1) {
|
||||
if (errno != EINTR)
|
||||
return EOF; /* Only signal interruption allowed */
|
||||
continue; /* If interruped and read nothing, just try again */
|
||||
}
|
||||
|
||||
/* r contains number of bytes sent so far */
|
||||
bytesDone += r;
|
||||
} while (bytesDone < len);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqGetString(char *s, size_t len, FILE *f)
|
||||
pqGetString(char *s, size_t len)
|
||||
{
|
||||
int c;
|
||||
|
||||
if (f == NULL)
|
||||
return EOF;
|
||||
|
||||
/*
|
||||
* Keep on reading until we get the terminating '\0' and discard those
|
||||
* bytes we don't have room for.
|
||||
*/
|
||||
|
||||
while ((c = getc(f)) != EOF && c != '\0')
|
||||
while ((c = pq_getchar()) != EOF && c != '\0')
|
||||
if (len > 1)
|
||||
{
|
||||
*s++ = c;
|
||||
@ -202,33 +210,8 @@ pqGetString(char *s, size_t len, FILE *f)
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqPutString(const char *s, FILE *f)
|
||||
pqPutString(const char *s)
|
||||
{
|
||||
if (f == NULL)
|
||||
return 0;
|
||||
|
||||
if (fputs(s, f) == EOF)
|
||||
return EOF;
|
||||
|
||||
fputc('\0', f); /* important to send an ending \0 since
|
||||
* backend expects it */
|
||||
|
||||
return 0;
|
||||
return pqPutNBytes(s,strlen(s)+1);
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqGetByte(FILE *f)
|
||||
{
|
||||
return getc(f);
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
int
|
||||
pqPutByte(int c, FILE *f)
|
||||
{
|
||||
if (!f)
|
||||
return 0;
|
||||
|
||||
return (putc(c, f) == c) ? 0 : EOF;
|
||||
}
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: libpq.h,v 1.22 1999/01/11 03:56:11 scrappy Exp $
|
||||
* $Id: libpq.h,v 1.23 1999/01/12 12:49:52 scrappy Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -262,6 +262,7 @@ extern int pq_getchar(void);
|
||||
extern int pq_peekchar(void);
|
||||
extern int pq_getnchar(char *s, int off, int maxlen);
|
||||
extern int pq_getint(int b);
|
||||
extern int pq_putchar(char c);
|
||||
extern void pq_putstr(char *s);
|
||||
extern void pq_putnchar(char *s, int n);
|
||||
extern void pq_putint(int i, int b);
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: pqcomm.h,v 1.29 1998/09/01 04:36:31 momjian Exp $
|
||||
* $Id: pqcomm.h,v 1.30 1999/01/12 12:49:52 scrappy Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -152,7 +152,7 @@ typedef struct CancelRequestPacket
|
||||
} CancelRequestPacket;
|
||||
|
||||
|
||||
/* in pqcompriv.c */
|
||||
/* in pqcomprim.c */
|
||||
int pqGetShort(int *, FILE *);
|
||||
int pqGetLong(int *, FILE *);
|
||||
int pqGetNBytes(char *, size_t, FILE *);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user