7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
413 lines
8.3 KiB
C
413 lines
8.3 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. 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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#if 0
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static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <errno.h>
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#include <stdarg.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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pid_t 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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pid_t pid;
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char done;
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char free;
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int status;
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struct child *link;
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};
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static struct child *child, *child_freelist = NULL;
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static void delchild(struct child *);
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static pid_t file_pid(FILE *);
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static pid_t start_commandv(char *, sigset_t *, int, int, va_list);
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FILE *
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Fopen(const char *path, const char *mode)
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{
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FILE *fp;
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if ((fp = fopen(path, 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(int fd, const 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(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(char *cmd, const 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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pid_t pid;
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sigset_t nset;
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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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hisside = fd0 = 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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(void)sigemptyset(&nset);
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pid = start_command(value("SHELL"), &nset, fd0, fd1, "-c", cmd, NULL);
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if (pid < 0) {
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(void)close(p[READ]);
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(void)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(FILE *ptr)
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{
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int i;
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sigset_t nset, oset;
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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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(void)sigemptyset(&nset);
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(void)sigaddset(&nset, SIGINT);
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(void)sigaddset(&nset, SIGHUP);
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(void)sigprocmask(SIG_BLOCK, &nset, &oset);
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i = wait_child(i);
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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return (i);
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}
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void
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close_all_files(void)
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{
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while (fp_head != NULL)
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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(FILE *fp, int pipe, pid_t pid)
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{
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struct fp *fpp;
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if ((fpp = malloc(sizeof(*fpp))) == NULL)
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err(1, "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(FILE *fp)
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{
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struct fp **pp, *p;
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for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
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if (p->fp == fp) {
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*pp = p->link;
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(void)free(p);
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return;
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}
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errx(1, "Invalid file pointer");
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/*NOTREACHED*/
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}
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pid_t
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file_pid(FILE *fp)
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{
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struct fp *p;
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for (p = fp_head; p != NULL; p = p->link)
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if (p->fp == fp)
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return (p->pid);
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errx(1, "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 (-1 means none) and stdout. The command name can be a sequence
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* of words.
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* Signals must be handled by the caller.
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* "nset" contains the signals to ignore in the new process.
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* SIGINT is enabled unless it's in "nset".
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*/
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static pid_t
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start_commandv(char *cmd, sigset_t *nset, int infd, int outfd, va_list args)
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{
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pid_t pid;
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if ((pid = fork()) < 0) {
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warn("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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while ((argv[i++] = va_arg(args, char *)))
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;
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argv[i] = NULL;
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prepare_child(nset, infd, outfd);
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execvp(argv[0], argv);
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warn("%s", 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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int
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run_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
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{
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pid_t pid;
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va_list args;
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va_start(args, outfd);
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pid = start_commandv(cmd, nset, infd, outfd, args);
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va_end(args);
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if (pid < 0)
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return -1;
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return wait_command(pid);
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}
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int
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start_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
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{
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va_list args;
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int r;
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va_start(args, outfd);
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r = start_commandv(cmd, nset, infd, outfd, args);
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va_end(args);
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return r;
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}
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void
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prepare_child(sigset_t *nset, int infd, int outfd)
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{
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int i;
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sigset_t eset;
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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 (nset != NULL && sigismember(nset, i))
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(void)signal(i, SIG_IGN);
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if (nset == NULL || !sigismember(nset, SIGINT))
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(void)signal(SIGINT, SIG_DFL);
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(void)sigemptyset(&eset);
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(void)sigprocmask(SIG_SETMASK, &eset, NULL);
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}
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int
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wait_command(pid_t 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_t pid, int dont_alloc)
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{
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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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if (dont_alloc)
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return(NULL);
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if (child_freelist) {
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*cpp = child_freelist;
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child_freelist = (*cpp)->link;
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} else {
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*cpp = malloc(sizeof(struct child));
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if (*cpp == NULL)
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err(1, "malloc");
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}
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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(struct child *cp)
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{
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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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cp->link = child_freelist;
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child_freelist = cp;
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}
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/*ARGSUSED*/
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void
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sigchild(int signo __unused)
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{
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pid_t pid;
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int status;
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struct child *cp;
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int save_errno;
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save_errno = errno;
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while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
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cp = findchild(pid, 1);
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if (cp == NULL)
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continue;
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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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errno = save_errno;
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}
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int 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_t pid)
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{
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struct child *cp;
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sigset_t nset, oset;
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pid_t rv = 0;
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(void)sigemptyset(&nset);
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(void)sigaddset(&nset, SIGCHLD);
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(void)sigprocmask(SIG_BLOCK, &nset, &oset);
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/*
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* If we have not already waited on the pid (via sigchild)
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* wait on it now. Otherwise, use the wait status stashed
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* by sigchild.
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*/
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cp = findchild(pid, 1);
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if (cp == NULL || !cp->done)
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rv = waitpid(pid, &wait_status, 0);
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else
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wait_status = cp->status;
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if (cp != NULL)
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delchild(cp);
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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if (rv == -1 || (WIFEXITED(wait_status) && WEXITSTATUS(wait_status)))
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return -1;
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else
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return 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_t pid)
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{
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struct child *cp;
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sigset_t nset, oset;
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(void)sigemptyset(&nset);
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(void)sigaddset(&nset, SIGCHLD);
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(void)sigprocmask(SIG_BLOCK, &nset, &oset);
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if ((cp = findchild(pid, 0)) != NULL) {
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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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}
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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}
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