mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*-
|
|
* 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));
|
|
}
|