mirror of
https://github.com/freebsd/freebsd-src
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196 lines
5 KiB
C
196 lines
5 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This code is derived from software written by Ken Arnold and
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* published in UNIX Review, Vol. 6, No. 8.
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*
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* Portions of this software were developed by Edward Tomasz Napierala
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* under sponsorship from the FreeBSD Foundation.
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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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <paths.h>
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#include "common.h"
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extern char **environ;
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struct pid {
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SLIST_ENTRY(pid) next;
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FILE *outfp;
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pid_t pid;
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char *command;
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};
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static SLIST_HEAD(, pid) pidlist = SLIST_HEAD_INITIALIZER(pidlist);
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#define ARGV_LEN 42
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/*
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* Replacement for popen(3), without stdin (which we do not use), but with
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* stderr, proper logging, and improved command line arguments passing.
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* Error handling is built in - if it returns, then it succeeded.
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*/
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FILE *
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auto_popen(const char *argv0, ...)
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{
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va_list ap;
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struct pid *cur, *p;
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pid_t pid;
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int error, i, nullfd, outfds[2];
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char *arg, *argv[ARGV_LEN], *command;
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nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
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if (nullfd < 0)
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log_err(1, "cannot open %s", _PATH_DEVNULL);
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error = pipe(outfds);
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if (error != 0)
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log_err(1, "pipe");
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cur = malloc(sizeof(struct pid));
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if (cur == NULL)
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log_err(1, "malloc");
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argv[0] = checked_strdup(argv0);
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command = argv[0];
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va_start(ap, argv0);
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for (i = 1;; i++) {
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if (i >= ARGV_LEN)
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log_errx(1, "too many arguments to auto_popen");
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arg = va_arg(ap, char *);
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argv[i] = arg;
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if (arg == NULL)
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break;
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command = concat(command, ' ', arg);
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}
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va_end(ap);
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cur->command = checked_strdup(command);
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switch (pid = fork()) {
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case -1: /* Error. */
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log_err(1, "fork");
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/* NOTREACHED */
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case 0: /* Child. */
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dup2(nullfd, STDIN_FILENO);
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dup2(outfds[1], STDOUT_FILENO);
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close(nullfd);
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close(outfds[0]);
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close(outfds[1]);
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SLIST_FOREACH(p, &pidlist, next)
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close(fileno(p->outfp));
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execvp(argv[0], argv);
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log_err(1, "failed to execute %s", argv[0]);
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/* NOTREACHED */
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}
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log_debugx("executing \"%s\" as pid %d", command, pid);
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/* Parent; assume fdopen cannot fail. */
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cur->outfp = fdopen(outfds[0], "r");
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close(nullfd);
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close(outfds[1]);
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/* Link into list of file descriptors. */
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cur->pid = pid;
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SLIST_INSERT_HEAD(&pidlist, cur, next);
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return (cur->outfp);
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}
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int
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auto_pclose(FILE *iop)
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{
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struct pid *cur, *last = NULL;
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int status;
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pid_t pid;
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/*
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* Find the appropriate file pointer and remove it from the list.
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*/
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SLIST_FOREACH(cur, &pidlist, next) {
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if (cur->outfp == iop)
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break;
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last = cur;
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}
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if (cur == NULL) {
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return (-1);
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}
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if (last == NULL)
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SLIST_REMOVE_HEAD(&pidlist, next);
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else
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SLIST_REMOVE_AFTER(last, next);
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fclose(cur->outfp);
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do {
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pid = wait4(cur->pid, &status, 0, NULL);
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} while (pid == -1 && errno == EINTR);
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if (WIFSIGNALED(status)) {
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log_warnx("\"%s\", pid %d, terminated with signal %d",
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cur->command, pid, WTERMSIG(status));
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return (status);
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}
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if (WEXITSTATUS(status) != 0) {
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log_warnx("\"%s\", pid %d, terminated with exit status %d",
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cur->command, pid, WEXITSTATUS(status));
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return (status);
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}
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log_debugx("\"%s\", pid %d, terminated gracefully", cur->command, pid);
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free(cur->command);
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free(cur);
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return (pid == -1 ? -1 : status);
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}
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