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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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/procdesc.h>
#include <sys/wait.h>
#include <err.h>
#include <paths.h>
#include <signal.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"
struct pr *
start_pr(char *file1, char *file2)
{
int pfd[2];
int pr_pd;
pid_t pid;
char *header;
struct pr *pr;
pr = xcalloc(1, sizeof(*pr));
xasprintf(&header, "%s %s %s", diffargs, file1, file2);
signal(SIGPIPE, SIG_IGN);
fflush(stdout);
rewind(stdout);
if (pipe(pfd) == -1)
err(2, "pipe");
switch ((pid = pdfork(&pr_pd, PD_CLOEXEC))) {
case -1:
status |= 2;
free(header);
err(2, "No more processes");
case 0:
/* child */
if (pfd[0] != STDIN_FILENO) {
dup2(pfd[0], STDIN_FILENO);
close(pfd[0]);
}
close(pfd[1]);
execl(_PATH_PR, _PATH_PR, "-h", header, (char *)0);
_exit(127);
default:
/* parent */
if (pfd[1] != STDOUT_FILENO) {
pr->ostdout = dup(STDOUT_FILENO);
dup2(pfd[1], STDOUT_FILENO);
close(pfd[1]);
close(pfd[1]);
}
close(pfd[0]);
rewind(stdout);
free(header);
pr->kq = kqueue();
if (pr->kq == -1)
err(2, "kqueue");
pr->e = xmalloc(sizeof(struct kevent));
EV_SET(pr->e, pr_pd, EVFILT_PROCDESC, EV_ADD, NOTE_EXIT, 0,
NULL);
if (kevent(pr->kq, pr->e, 1, NULL, 0, NULL) == -1)
err(2, "kevent");
}
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) {
close(STDOUT_FILENO);
dup2(pr->ostdout, STDOUT_FILENO);
close(pr->ostdout);
}
if (kevent(pr->kq, NULL, 0, pr->e, 1, NULL) == -1)
err(2, "kevent");
wstatus = pr->e[0].data;
close(pr->kq);
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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