374 lines
7.2 KiB
C
374 lines
7.2 KiB
C
|
/*
|
||
|
|
* Copyright (c) 1980, 1993
|
||
|
|
* The Regents of the University of California. All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. 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.
|
||
|
|
* 3. All advertising materials mentioning features or use of this software
|
||
|
|
* must display the following acknowledgement:
|
||
|
|
* This product includes software developed by the University of
|
||
|
|
* California, Berkeley and its contributors.
|
||
|
|
* 4. Neither the name of the University 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 REGENTS 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef lint
|
||
|
|
static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
|
||
|
|
#endif /* not lint */
|
||
|
|
|
||
|
|
#include "rcv.h"
|
||
|
|
#include <sys/wait.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include "extern.h"
|
||
|
|
|
||
|
|
#define READ 0
|
||
|
|
#define WRITE 1
|
||
|
|
|
||
|
|
struct fp {
|
||
|
|
FILE *fp;
|
||
|
|
int pipe;
|
||
|
|
int pid;
|
||
|
|
struct fp *link;
|
||
|
|
};
|
||
|
|
static struct fp *fp_head;
|
||
|
|
|
||
|
|
struct child {
|
||
|
|
int pid;
|
||
|
|
char done;
|
||
|
|
char free;
|
||
|
|
union wait status;
|
||
|
|
struct child *link;
|
||
|
|
};
|
||
|
|
static struct child *child;
|
||
|
|
static struct child *findchild __P((int));
|
||
|
|
static void delchild __P((struct child *));
|
||
|
|
|
||
|
|
FILE *
|
||
|
|
Fopen(file, mode)
|
||
|
|
char *file, *mode;
|
||
|
|
{
|
||
|
|
FILE *fp;
|
||
|
|
|
||
|
|
if ((fp = fopen(file, mode)) != NULL) {
|
||
|
|
register_file(fp, 0, 0);
|
||
|
|
(void) fcntl(fileno(fp), F_SETFD, 1);
|
||
|
|
}
|
||
|
|
return fp;
|
||
|
|
}
|
||
|
|
|
||
|
|
FILE *
|
||
|
|
Fdopen(fd, mode)
|
||
|
|
int fd;
|
||
|
|
char *mode;
|
||
|
|
{
|
||
|
|
FILE *fp;
|
||
|
|
|
||
|
|
if ((fp = fdopen(fd, mode)) != NULL) {
|
||
|
|
register_file(fp, 0, 0);
|
||
|
|
(void) fcntl(fileno(fp), F_SETFD, 1);
|
||
|
|
}
|
||
|
|
return fp;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
Fclose(fp)
|
||
|
|
FILE *fp;
|
||
|
|
{
|
||
|
|
unregister_file(fp);
|
||
|
|
return fclose(fp);
|
||
|
|
}
|
||
|
|
|
||
|
|
FILE *
|
||
|
|
Popen(cmd, mode)
|
||
|
|
char *cmd;
|
||
|
|
char *mode;
|
||
|
|
{
|
||
|
|
int p[2];
|
||
|
|
int myside, hisside, fd0, fd1;
|
||
|
|
int pid;
|
||
|
|
FILE *fp;
|
||
|
|
|
||
|
|
if (pipe(p) < 0)
|
||
|
|
return NULL;
|
||
|
|
(void) fcntl(p[READ], F_SETFD, 1);
|
||
|
|
(void) fcntl(p[WRITE], F_SETFD, 1);
|
||
|
|
if (*mode == 'r') {
|
||
|
|
myside = p[READ];
|
||
|
|
fd0 = -1;
|
||
|
|
hisside = fd1 = p[WRITE];
|
||
|
|
} else {
|
||
|
|
myside = p[WRITE];
|
||
|
|
hisside = fd0 = p[READ];
|
||
|
|
fd1 = -1;
|
||
|
|
}
|
||
|
|
if ((pid = start_command(cmd, 0, fd0, fd1, NOSTR, NOSTR, NOSTR)) < 0) {
|
||
|
|
close(p[READ]);
|
||
|
|
close(p[WRITE]);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
(void) close(hisside);
|
||
|
|
if ((fp = fdopen(myside, mode)) != NULL)
|
||
|
|
register_file(fp, 1, pid);
|
||
|
|
return fp;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
Pclose(ptr)
|
||
|
|
FILE *ptr;
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
int omask;
|
||
|
|
|
||
|
|
i = file_pid(ptr);
|
||
|
|
unregister_file(ptr);
|
||
|
|
(void) fclose(ptr);
|
||
|
|
omask = sigblock(sigmask(SIGINT)|sigmask(SIGHUP));
|
||
|
|
i = wait_child(i);
|
||
|
|
sigsetmask(omask);
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
close_all_files()
|
||
|
|
{
|
||
|
|
|
||
|
|
while (fp_head)
|
||
|
|
if (fp_head->pipe)
|
||
|
|
(void) Pclose(fp_head->fp);
|
||
|
|
else
|
||
|
|
(void) Fclose(fp_head->fp);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
register_file(fp, pipe, pid)
|
||
|
|
FILE *fp;
|
||
|
|
int pipe, pid;
|
||
|
|
{
|
||
|
|
struct fp *fpp;
|
||
|
|
|
||
|
|
if ((fpp = (struct fp *) malloc(sizeof *fpp)) == NULL)
|
||
|
|
panic("Out of memory");
|
||
|
|
fpp->fp = fp;
|
||
|
|
fpp->pipe = pipe;
|
||
|
|
fpp->pid = pid;
|
||
|
|
fpp->link = fp_head;
|
||
|
|
fp_head = fpp;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
unregister_file(fp)
|
||
|
|
FILE *fp;
|
||
|
|
{
|
||
|
|
struct fp **pp, *p;
|
||
|
|
|
||
|
|
for (pp = &fp_head; p = *pp; pp = &p->link)
|
||
|
|
if (p->fp == fp) {
|
||
|
|
*pp = p->link;
|
||
|
|
free((char *) p);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
panic("Invalid file pointer");
|
||
|
|
}
|
||
|
|
|
||
|
|
file_pid(fp)
|
||
|
|
FILE *fp;
|
||
|
|
{
|
||
|
|
struct fp *p;
|
||
|
|
|
||
|
|
for (p = fp_head; p; p = p->link)
|
||
|
|
if (p->fp == fp)
|
||
|
|
return (p->pid);
|
||
|
|
panic("Invalid file pointer");
|
||
|
|
/*NOTREACHED*/
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Run a command without a shell, with optional arguments and splicing
|
||
|
|
* of stdin and stdout. The command name can be a sequence of words.
|
||
|
|
* Signals must be handled by the caller.
|
||
|
|
* "Mask" contains the signals to ignore in the new process.
|
||
|
|
* SIGINT is enabled unless it's in the mask.
|
||
|
|
*/
|
||
|
|
/*VARARGS4*/
|
||
|
|
int
|
||
|
|
run_command(cmd, mask, infd, outfd, a0, a1, a2)
|
||
|
|
char *cmd;
|
||
|
|
int mask, infd, outfd;
|
||
|
|
char *a0, *a1, *a2;
|
||
|
|
{
|
||
|
|
int pid;
|
||
|
|
|
||
|
|
if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
|
||
|
|
return -1;
|
||
|
|
return wait_command(pid);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*VARARGS4*/
|
||
|
|
int
|
||
|
|
start_command(cmd, mask, infd, outfd, a0, a1, a2)
|
||
|
|
char *cmd;
|
||
|
|
int mask, infd, outfd;
|
||
|
|
char *a0, *a1, *a2;
|
||
|
|
{
|
||
|
|
int pid;
|
||
|
|
|
||
|
|
if ((pid = vfork()) < 0) {
|
||
|
|
perror("fork");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if (pid == 0) {
|
||
|
|
char *argv[100];
|
||
|
|
int i = getrawlist(cmd, argv, sizeof argv / sizeof *argv);
|
||
|
|
|
||
|
|
if ((argv[i++] = a0) != NOSTR &&
|
||
|
|
(argv[i++] = a1) != NOSTR &&
|
||
|
|
(argv[i++] = a2) != NOSTR)
|
||
|
|
argv[i] = NOSTR;
|
||
|
|
prepare_child(mask, infd, outfd);
|
||
|
|
execvp(argv[0], argv);
|
||
|
|
perror(argv[0]);
|
||
|
|
_exit(1);
|
||
|
|
}
|
||
|
|
return pid;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
prepare_child(mask, infd, outfd)
|
||
|
|
int mask, infd, outfd;
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* All file descriptors other than 0, 1, and 2 are supposed to be
|
||
|
|
* close-on-exec.
|
||
|
|
*/
|
||
|
|
if (infd >= 0)
|
||
|
|
dup2(infd, 0);
|
||
|
|
if (outfd >= 0)
|
||
|
|
dup2(outfd, 1);
|
||
|
|
for (i = 1; i <= NSIG; i++)
|
||
|
|
if (mask & sigmask(i))
|
||
|
|
(void) signal(i, SIG_IGN);
|
||
|
|
if ((mask & sigmask(SIGINT)) == 0)
|
||
|
|
(void) signal(SIGINT, SIG_DFL);
|
||
|
|
(void) sigsetmask(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
wait_command(pid)
|
||
|
|
int pid;
|
||
|
|
{
|
||
|
|
|
||
|
|
if (wait_child(pid) < 0) {
|
||
|
|
printf("Fatal error in process.\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct child *
|
||
|
|
findchild(pid)
|
||
|
|
int pid;
|
||
|
|
{
|
||
|
|
register struct child **cpp;
|
||
|
|
|
||
|
|
for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
|
||
|
|
cpp = &(*cpp)->link)
|
||
|
|
;
|
||
|
|
if (*cpp == NULL) {
|
||
|
|
*cpp = (struct child *) malloc(sizeof (struct child));
|
||
|
|
(*cpp)->pid = pid;
|
||
|
|
(*cpp)->done = (*cpp)->free = 0;
|
||
|
|
(*cpp)->link = NULL;
|
||
|
|
}
|
||
|
|
return *cpp;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
delchild(cp)
|
||
|
|
register struct child *cp;
|
||
|
|
{
|
||
|
|
register struct child **cpp;
|
||
|
|
|
||
|
|
for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
|
||
|
|
;
|
||
|
|
*cpp = cp->link;
|
||
|
|
free((char *) cp);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
sigchild(signo)
|
||
|
|
int signo;
|
||
|
|
{
|
||
|
|
int pid;
|
||
|
|
union wait status;
|
||
|
|
register struct child *cp;
|
||
|
|
|
||
|
|
while ((pid =
|
||
|
|
wait3((int *)&status, WNOHANG, (struct rusage *)0)) > 0) {
|
||
|
|
cp = findchild(pid);
|
||
|
|
if (cp->free)
|
||
|
|
delchild(cp);
|
||
|
|
else {
|
||
|
|
cp->done = 1;
|
||
|
|
cp->status = status;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
union wait wait_status;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Wait for a specific child to die.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
wait_child(pid)
|
||
|
|
int pid;
|
||
|
|
{
|
||
|
|
int mask = sigblock(sigmask(SIGCHLD));
|
||
|
|
register struct child *cp = findchild(pid);
|
||
|
|
|
||
|
|
while (!cp->done)
|
||
|
|
sigpause(mask);
|
||
|
|
wait_status = cp->status;
|
||
|
|
delchild(cp);
|
||
|
|
sigsetmask(mask);
|
||
|
|
return wait_status.w_status ? -1 : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Mark a child as don't care.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
free_child(pid)
|
||
|
|
int pid;
|
||
|
|
{
|
||
|
|
int mask = sigblock(sigmask(SIGCHLD));
|
||
|
|
register struct child *cp = findchild(pid);
|
||
|
|
|
||
|
|
if (cp->done)
|
||
|
|
delchild(cp);
|
||
|
|
else
|
||
|
|
cp->free = 1;
|
||
|
|
sigsetmask(mask);
|
||
|
|
}
|