b6707d5d72
popen(), but worse. The child calls execvp(), which calls malloc() a bit more than execl(), and it calls non-library functions that call malloc() and who-knows-what else (stdio is called in at least some error cases).
374 lines
7.2 KiB
C
374 lines
7.2 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "rcv.h"
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#include <sys/wait.h>
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#include <fcntl.h>
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#include "extern.h"
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#define READ 0
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#define WRITE 1
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struct fp {
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FILE *fp;
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int pipe;
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int pid;
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struct fp *link;
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};
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static struct fp *fp_head;
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struct child {
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int pid;
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char done;
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char free;
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union wait status;
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struct child *link;
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};
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static struct child *child;
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static struct child *findchild __P((int));
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static void delchild __P((struct child *));
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FILE *
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Fopen(file, mode)
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char *file, *mode;
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{
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FILE *fp;
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if ((fp = fopen(file, mode)) != NULL) {
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register_file(fp, 0, 0);
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(void) fcntl(fileno(fp), F_SETFD, 1);
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}
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return fp;
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}
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FILE *
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Fdopen(fd, mode)
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int fd;
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char *mode;
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{
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FILE *fp;
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if ((fp = fdopen(fd, mode)) != NULL) {
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register_file(fp, 0, 0);
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(void) fcntl(fileno(fp), F_SETFD, 1);
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}
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return fp;
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}
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int
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Fclose(fp)
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FILE *fp;
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{
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unregister_file(fp);
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return fclose(fp);
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}
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FILE *
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Popen(cmd, mode)
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char *cmd;
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char *mode;
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{
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int p[2];
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int myside, hisside, fd0, fd1;
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int pid;
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FILE *fp;
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if (pipe(p) < 0)
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return NULL;
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(void) fcntl(p[READ], F_SETFD, 1);
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(void) fcntl(p[WRITE], F_SETFD, 1);
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if (*mode == 'r') {
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myside = p[READ];
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fd0 = -1;
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hisside = fd1 = p[WRITE];
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} else {
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myside = p[WRITE];
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hisside = fd0 = p[READ];
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fd1 = -1;
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}
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if ((pid = start_command(cmd, 0, fd0, fd1, NOSTR, NOSTR, NOSTR)) < 0) {
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close(p[READ]);
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close(p[WRITE]);
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return NULL;
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}
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(void) close(hisside);
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if ((fp = fdopen(myside, mode)) != NULL)
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register_file(fp, 1, pid);
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return fp;
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}
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int
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Pclose(ptr)
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FILE *ptr;
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{
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int i;
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int omask;
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i = file_pid(ptr);
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unregister_file(ptr);
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(void) fclose(ptr);
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omask = sigblock(sigmask(SIGINT)|sigmask(SIGHUP));
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i = wait_child(i);
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sigsetmask(omask);
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return i;
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}
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void
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close_all_files()
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{
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while (fp_head)
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if (fp_head->pipe)
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(void) Pclose(fp_head->fp);
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else
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(void) Fclose(fp_head->fp);
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}
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void
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register_file(fp, pipe, pid)
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FILE *fp;
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int pipe, pid;
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{
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struct fp *fpp;
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if ((fpp = (struct fp *) malloc(sizeof *fpp)) == NULL)
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panic("Out of memory");
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fpp->fp = fp;
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fpp->pipe = pipe;
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fpp->pid = pid;
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fpp->link = fp_head;
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fp_head = fpp;
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}
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void
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unregister_file(fp)
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FILE *fp;
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{
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struct fp **pp, *p;
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for (pp = &fp_head; p = *pp; pp = &p->link)
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if (p->fp == fp) {
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*pp = p->link;
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free((char *) p);
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return;
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}
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panic("Invalid file pointer");
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}
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file_pid(fp)
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FILE *fp;
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{
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struct fp *p;
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for (p = fp_head; p; p = p->link)
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if (p->fp == fp)
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return (p->pid);
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panic("Invalid file pointer");
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/*NOTREACHED*/
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}
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/*
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* Run a command without a shell, with optional arguments and splicing
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* of stdin and stdout. The command name can be a sequence of words.
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* Signals must be handled by the caller.
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* "Mask" contains the signals to ignore in the new process.
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* SIGINT is enabled unless it's in the mask.
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*/
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/*VARARGS4*/
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int
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run_command(cmd, mask, infd, outfd, a0, a1, a2)
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char *cmd;
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int mask, infd, outfd;
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char *a0, *a1, *a2;
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{
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int pid;
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if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
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return -1;
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return wait_command(pid);
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}
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/*VARARGS4*/
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int
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start_command(cmd, mask, infd, outfd, a0, a1, a2)
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char *cmd;
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int mask, infd, outfd;
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char *a0, *a1, *a2;
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{
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int pid;
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if ((pid = fork()) < 0) {
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perror("fork");
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return -1;
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}
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if (pid == 0) {
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char *argv[100];
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int i = getrawlist(cmd, argv, sizeof argv / sizeof *argv);
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if ((argv[i++] = a0) != NOSTR &&
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(argv[i++] = a1) != NOSTR &&
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(argv[i++] = a2) != NOSTR)
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argv[i] = NOSTR;
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prepare_child(mask, infd, outfd);
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execvp(argv[0], argv);
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perror(argv[0]);
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_exit(1);
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}
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return pid;
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}
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void
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prepare_child(mask, infd, outfd)
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int mask, infd, outfd;
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{
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int i;
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/*
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* All file descriptors other than 0, 1, and 2 are supposed to be
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* close-on-exec.
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*/
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if (infd >= 0)
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dup2(infd, 0);
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if (outfd >= 0)
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dup2(outfd, 1);
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for (i = 1; i <= NSIG; i++)
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if (mask & sigmask(i))
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(void) signal(i, SIG_IGN);
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if ((mask & sigmask(SIGINT)) == 0)
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(void) signal(SIGINT, SIG_DFL);
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(void) sigsetmask(0);
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}
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int
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wait_command(pid)
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int pid;
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{
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if (wait_child(pid) < 0) {
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printf("Fatal error in process.\n");
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return -1;
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}
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return 0;
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}
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static struct child *
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findchild(pid)
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int pid;
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{
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register struct child **cpp;
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for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
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cpp = &(*cpp)->link)
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;
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if (*cpp == NULL) {
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*cpp = (struct child *) malloc(sizeof (struct child));
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(*cpp)->pid = pid;
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(*cpp)->done = (*cpp)->free = 0;
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(*cpp)->link = NULL;
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}
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return *cpp;
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}
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static void
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delchild(cp)
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register struct child *cp;
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{
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register struct child **cpp;
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for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
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;
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*cpp = cp->link;
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free((char *) cp);
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}
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void
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sigchild(signo)
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int signo;
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{
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int pid;
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union wait status;
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register struct child *cp;
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while ((pid =
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wait3((int *)&status, WNOHANG, (struct rusage *)0)) > 0) {
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cp = findchild(pid);
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if (cp->free)
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delchild(cp);
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else {
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cp->done = 1;
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cp->status = status;
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}
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}
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}
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union wait wait_status;
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/*
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* Wait for a specific child to die.
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*/
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int
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wait_child(pid)
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int pid;
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{
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int mask = sigblock(sigmask(SIGCHLD));
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register struct child *cp = findchild(pid);
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while (!cp->done)
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sigpause(mask);
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wait_status = cp->status;
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delchild(cp);
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sigsetmask(mask);
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return wait_status.w_status ? -1 : 0;
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}
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/*
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* Mark a child as don't care.
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*/
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void
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free_child(pid)
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int pid;
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{
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int mask = sigblock(sigmask(SIGCHLD));
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register struct child *cp = findchild(pid);
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if (cp->done)
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delchild(cp);
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else
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cp->free = 1;
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sigsetmask(mask);
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}
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