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124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*-
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* Copyright (c) 2017 Baptiste Daroussin <bapt@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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* in this position and unchanged.
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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(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/procdesc.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <paths.h>
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#include <signal.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 "pr.h"
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#include "diff.h"
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#include "xmalloc.h"
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#define _PATH_PR "/usr/bin/pr"
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struct pr *
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start_pr(char *file1, char *file2)
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{
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int pfd[2];
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int pr_pd;
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pid_t pid;
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char *header;
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struct pr *pr;
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pr = xcalloc(1, sizeof(*pr));
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xasprintf(&header, "%s %s %s", diffargs, file1, file2);
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signal(SIGPIPE, SIG_IGN);
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fflush(stdout);
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rewind(stdout);
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if (pipe(pfd) == -1)
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err(2, "pipe");
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switch ((pid = pdfork(&pr_pd, PD_CLOEXEC))) {
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case -1:
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status |= 2;
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free(header);
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err(2, "No more processes");
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case 0:
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/* child */
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if (pfd[0] != STDIN_FILENO) {
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dup2(pfd[0], STDIN_FILENO);
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close(pfd[0]);
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}
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close(pfd[1]);
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execl(_PATH_PR, _PATH_PR, "-h", header, (char *)0);
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_exit(127);
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default:
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/* parent */
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if (pfd[1] != STDOUT_FILENO) {
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pr->ostdout = dup(STDOUT_FILENO);
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dup2(pfd[1], STDOUT_FILENO);
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close(pfd[1]);
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}
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close(pfd[0]);
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rewind(stdout);
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free(header);
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pr->kq = kqueue();
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if (pr->kq == -1)
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err(2, "kqueue");
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pr->e = xmalloc(sizeof(struct kevent));
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EV_SET(pr->e, pr_pd, EVFILT_PROCDESC, EV_ADD, NOTE_EXIT, 0,
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NULL);
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if (kevent(pr->kq, pr->e, 1, NULL, 0, NULL) == -1)
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err(2, "kevent");
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}
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return (pr);
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}
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/* close the pipe to pr and restore stdout */
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void
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stop_pr(struct pr *pr)
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{
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int wstatus;
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if (pr == NULL)
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return;
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fflush(stdout);
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if (pr->ostdout != STDOUT_FILENO) {
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close(STDOUT_FILENO);
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dup2(pr->ostdout, STDOUT_FILENO);
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close(pr->ostdout);
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}
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if (kevent(pr->kq, NULL, 0, pr->e, 1, NULL) == -1)
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err(2, "kevent");
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wstatus = pr->e[0].data;
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close(pr->kq);
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free(pr);
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if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != 0)
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errx(2, "pr exited abnormally");
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else if (WIFSIGNALED(wstatus))
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errx(2, "pr killed by signal %d",
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WTERMSIG(wstatus));
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}
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