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/*-
* Copyright (c) 2017 Baptiste Daroussin <bapt@FreeBSD.org>
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
*/
#include <sys/procdesc.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <spawn.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "pr.h"
#include "diff.h"
#include "xmalloc.h"
#define _PATH_PR "/usr/bin/pr"
extern char **environ;
struct pr *
start_pr(char *file1, char *file2)
{
int pfd[2];
pid_t pid;
char *header;
struct pr *pr;
posix_spawn_file_actions_t fa;
posix_spawnattr_t sa;
int error;
pr = xcalloc(1, sizeof(*pr));
xasprintf(&header, "%s %s %s", diffargs, file1, file2);
signal(SIGPIPE, SIG_IGN);
fflush(stdout);
if (pipe2(pfd, O_CLOEXEC) == -1)
err(2, "pipe");
if ((error = posix_spawnattr_init(&sa)) != 0)
errc(2, error, "posix_spawnattr_init");
if ((error = posix_spawn_file_actions_init(&fa)) != 0)
errc(2, error, "posix_spawn_file_actions_init");
posix_spawnattr_setprocdescp_np(&sa, &pr->procd, 0);
error = posix_spawn_file_actions_adddup2(&fa, pfd[0], STDIN_FILENO);
if (error != 0)
errc(2, error, "posix_spawn_file_actions_adddup2");
char *argv[] = { __DECONST(char *, _PATH_PR),
__DECONST(char *, "-h"), header, NULL };
error = posix_spawn(&pid, _PATH_PR, &fa, &sa, argv, environ);
if (error != 0)
errc(2, error, "could not spawn pr");
posix_spawn_file_actions_destroy(&fa);
posix_spawnattr_destroy(&sa);
/* parent */
if (pfd[1] == STDOUT_FILENO) {
pr->ostdout = STDOUT_FILENO;
} else {
if ((pr->ostdout = dup(STDOUT_FILENO)) < 0 ||
dup2(pfd[1], STDOUT_FILENO) < 0) {
err(2, "stdout");
}
close(pfd[1]);
}
close(pfd[0]);
free(header);
return (pr);
}
/* close the pipe to pr and restore stdout */
void
stop_pr(struct pr *pr)
{
int wstatus;
if (pr == NULL)
return;
fflush(stdout);
if (pr->ostdout != STDOUT_FILENO) {
dup2(pr->ostdout, STDOUT_FILENO);
close(pr->ostdout);
}
while (pdwait(pr->procd, &wstatus, WEXITED, NULL, NULL) == -1) {
if (errno != EINTR)
err(2, "pdwait");
}
close(pr->procd);
free(pr);
if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != 0)
errx(2, "pr exited abnormally");
else if (WIFSIGNALED(wstatus))
errx(2, "pr killed by signal %d",
WTERMSIG(wstatus));
}
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