108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
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/*-
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* Copyright (c) 2013-2014 Devin Teske <dteske@FreeBSD.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <limits.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
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extern char **environ;
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static char cmdbuf[CMDBUFMAX] = "";
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static char shellcmd[PATH_MAX] = PATH_SHELL;
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static char *shellcmd_argv[6] = {
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shellcmd,
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__DECONST(char *, "-c"),
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cmdbuf,
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__DECONST(char *, "--"),
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shellcmd,
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NULL,
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};
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/*
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* Spawn a sh(1) command. Writes the resulting process ID to the pid_t pointed
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* at by `pid'. Returns a file descriptor (int) suitable for writing data to
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* the spawned command (data written to file descriptor is seen as standard-in
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* by the spawned sh(1) command). Returns `-1' if unable to spawn command.
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*
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* If cmd contains a single "%s" sequence, replace it with label if non-NULL.
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*/
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int
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shell_spawn_pipecmd(const char *cmd, const char *label, pid_t *pid)
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{
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int error;
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int len;
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posix_spawn_file_actions_t action;
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#if SHELL_SPAWN_DEBUG
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unsigned int i;
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#endif
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int stdin_pipe[2] = { -1, -1 };
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/* Populate argument array */
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if (label != NULL && fmtcheck(cmd, "%s") == cmd)
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len = snprintf(cmdbuf, CMDBUFMAX, cmd, label);
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else
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len = snprintf(cmdbuf, CMDBUFMAX, "%s", cmd);
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if (len >= CMDBUFMAX) {
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warnx("%s:%d:%s: cmdbuf[%u] too small to hold cmd argument",
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__FILE__, __LINE__, __func__, CMDBUFMAX);
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return (-1);
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}
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/* Open a pipe to communicate with [X]dialog(1) */
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if (pipe(stdin_pipe) < 0)
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err(EXIT_FAILURE, "%s: pipe(2)", __func__);
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/* Fork sh(1) process */
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#if SHELL_SPAWN_DEBUG
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fprintf(stderr, "%s: spawning `", __func__);
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for (i = 0; shellcmd_argv[i] != NULL; i++) {
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if (i == 0)
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fprintf(stderr, "%s", shellcmd_argv[i]);
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else if (i == 2)
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fprintf(stderr, " '%s'", shellcmd_argv[i]);
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else
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fprintf(stderr, " %s", shellcmd_argv[i]);
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}
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fprintf(stderr, "'\n");
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#endif
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posix_spawn_file_actions_init(&action);
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posix_spawn_file_actions_adddup2(&action, stdin_pipe[0], STDIN_FILENO);
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posix_spawn_file_actions_addclose(&action, stdin_pipe[1]);
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error = posix_spawnp(pid, shellcmd, &action,
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(const posix_spawnattr_t *)NULL, shellcmd_argv, environ);
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if (error != 0)
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err(EXIT_FAILURE, "%s: posix_spawnp(3)", __func__);
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return stdin_pipe[1];
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}
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