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/*===========================================================================
Copyright (c) 1998-2000, The Santa Cruz Operation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
*Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
*Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
*Neither name of The Santa Cruz Operation nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
=========================================================================*/
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "global.h" /* pid_t, RETSIGTYPE, shell, and mybasename() */
#define tst(a,b) (*mode == 'r'? (b) : (a))
#define RDR 0
#define WTR 1
/* HBB 20010312: make this a bit safer --- don't blindly assume it's 1 */
#ifdef FD_CLOEXEC
# define CLOSE_ON_EXEC FD_CLOEXEC
#else
# define CLOSE_ON_EXEC 1
#endif
#ifdef HAVE_IO_H
# include <io.h> /* for setmode() */
#endif
static char const rcsid[] = "$Id: mypopen.c,v 1.14 2006/04/21 10:40:29 broeker Exp $";
static pid_t popen_pid[20];
static RETSIGTYPE (*tstat)(int);
int
myopen(char *path, int flag, int mode)
{
/* opens a file descriptor and then sets close-on-exec for the file */
int fd;
/* 20020103: if file is not explicitly in Binary mode, make
* sure we override silly Cygwin behaviour of automatic binary
* mode for files in "binary mounted" paths */
#if O_BINARY != O_TEXT
if (! (flag | O_BINARY))
flag |= O_TEXT;
#endif
if(mode)
fd = open(path, flag, mode);
else
fd = open(path, flag);
#ifdef __DJGPP__ /* FIXME: test feature, not platform */
/* HBB 20010312: DOS GCC doesn't have FD_CLOEXEC (yet), so it
* always fails this call. Have to skip that step */
if(fd != -1)
return(fd);
#endif
if(fd != -1 && (fcntl(fd, F_SETFD, CLOSE_ON_EXEC) != -1))
return(fd);
else
{
/* Ensure that if the fcntl fails and fd is valid, then
the file is closed properly. In general this should
not happen. */
if (fd != -1)
{
close (fd);
}
return(-1);
}
}
FILE *
myfopen(char *path, char *mode)
{
/* opens a file pointer and then sets close-on-exec for the file */
FILE *fp;
fp = fopen(path, mode);
#ifdef SETMODE
if (fp && ! strchr(mode, 'b')) {
SETMODE(fileno(fp), O_TEXT);
}
#endif /* SETMODE */
#ifdef __DJGPP__ /* FIXME: test feature, not platform */
/* HBB 20010312: DOS GCC doesn't have FD_CLOEXEC (yet), so it
* always fails this call. Have to skip that step */
if(fp)
#else
if(fp && (fcntl(fileno(fp), F_SETFD, CLOSE_ON_EXEC) != -1))
#endif
return(fp);
else
return(NULL);
}
FILE *
mypopen(char *cmd, char *mode)
{
#ifdef __DJGPP__
/* HBB 20010312: Has its own implementation of popen(), which
* is better suited to the platform than cscope's */
return (popen)(cmd, mode);
#else
int p[2];
pid_t *poptr;
int myside, yourside;
pid_t pid;
if(pipe(p) < 0)
return(NULL);
myside = tst(p[WTR], p[RDR]);
yourside = tst(p[RDR], p[WTR]);
if((pid = fork()) == 0) {
/* myside and yourside reverse roles in child */
int stdio;
/* close all pipes from other popen's */
for (poptr = popen_pid; poptr < popen_pid+20; poptr++) {
if(*poptr)
(void) close(poptr - popen_pid);
}
stdio = tst(0, 1);
close(myside);
close(stdio);
#if V9
dup2(yourside, stdio);
#else
fcntl(yourside, F_DUPFD, stdio);
#endif
close(yourside);
execlp(shell, mybasename(shell), "-c", cmd, (void *)0);
_exit(1);
} else if (pid > 0)
tstat = signal(SIGTSTP, SIG_DFL);
if(pid == -1)
return(NULL);
popen_pid[myside] = pid;
(void) close(yourside);
return(fdopen(myside, mode));
#endif /* DJGPP */
}
/* HBB 20010705: renamed from 'pclose', which would collide with
* system-supplied function of same name */
int
mypclose(FILE *ptr)
{
int f;
pid_t r;
int status;
sighandler_t hstat, istat, qstat;
#ifdef __DJGPP__
/* HBB 20010705: This system has its own pclose(), which we
* don't want to replace */
return (pclose)(ptr);
#else
f = fileno(ptr);
(void) fclose(ptr);
istat = signal(SIGINT, SIG_IGN);
qstat = signal(SIGQUIT, SIG_IGN);
hstat = signal(SIGHUP, SIG_IGN);
while((r = wait(&status)) != popen_pid[f] && r != -1)
;
if(r == -1)
status = -1;
(void) signal(SIGINT, istat);
(void) signal(SIGQUIT, qstat);
(void) signal(SIGHUP, hstat);
(void) signal(SIGTSTP, tstat);
/* mark this pipe closed */
popen_pid[f] = 0;
return(status);
#endif /* DJGPP */
}
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