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562af864bd
Conflicts: Makefile cmd-list-commands.c cmd-suspend-client.c job.c tmux.h xmalloc.c
192 lines
4.5 KiB
C
192 lines
4.5 KiB
C
/* $Id$ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include "tmux.h"
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/*
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* Job scheduling. Run queued commands in the background and record their
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* output.
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*/
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void job_callback(struct bufferevent *, short, void *);
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void job_write_callback(struct bufferevent *, void *);
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/* All jobs list. */
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struct joblist all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
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/* Start a job running, if it isn't already. */
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struct job *
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job_run(const char *cmd, struct session *s,
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void (*callbackfn)(struct job *), void (*freefn)(void *), void *data)
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{
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struct job *job;
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struct environ env;
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pid_t pid;
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int nullfd, out[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
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return (NULL);
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environ_init(&env);
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environ_copy(&global_environ, &env);
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if (s != NULL)
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environ_copy(&s->environ, &env);
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server_fill_environ(s, &env);
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switch (pid = fork()) {
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case -1:
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environ_free(&env);
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close(out[0]);
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close(out[1]);
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return (NULL);
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case 0: /* child */
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clear_signals(1);
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environ_push(&env);
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environ_free(&env);
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if (dup2(out[1], STDIN_FILENO) == -1)
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fatal("dup2 failed");
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if (dup2(out[1], STDOUT_FILENO) == -1)
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fatal("dup2 failed");
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if (out[1] != STDIN_FILENO && out[1] != STDOUT_FILENO)
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close(out[1]);
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close(out[0]);
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nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
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if (nullfd < 0)
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fatal("open failed");
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if (dup2(nullfd, STDERR_FILENO) == -1)
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fatal("dup2 failed");
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if (nullfd != STDERR_FILENO)
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close(nullfd);
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closefrom(STDERR_FILENO + 1);
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execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
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fatal("execl failed");
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}
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/* parent */
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environ_free(&env);
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close(out[1]);
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job = xmalloc(sizeof *job);
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job->cmd = xstrdup(cmd);
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job->pid = pid;
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job->status = 0;
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LIST_INSERT_HEAD(&all_jobs, job, lentry);
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job->callbackfn = callbackfn;
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job->freefn = freefn;
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job->data = data;
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job->fd = out[0];
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setblocking(job->fd, 0);
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job->event = bufferevent_new(job->fd, NULL, job_write_callback,
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job_callback, job);
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bufferevent_enable(job->event, EV_READ|EV_WRITE);
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log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
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return (job);
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}
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/* Kill and free an individual job. */
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void
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job_free(struct job *job)
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{
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log_debug("free job %p: %s", job, job->cmd);
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LIST_REMOVE(job, lentry);
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free(job->cmd);
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if (job->freefn != NULL && job->data != NULL)
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job->freefn(job->data);
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if (job->pid != -1)
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kill(job->pid, SIGTERM);
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if (job->event != NULL)
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bufferevent_free(job->event);
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if (job->fd != -1)
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close(job->fd);
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free(job);
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}
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/* Called when output buffer falls below low watermark (default is 0). */
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void
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job_write_callback(unused struct bufferevent *bufev, void *data)
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{
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struct job *job = data;
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size_t len = EVBUFFER_LENGTH(EVBUFFER_OUTPUT(job->event));
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log_debug("job write %p: %s, pid %ld, output left %zu", job, job->cmd,
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(long) job->pid, len);
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if (len == 0) {
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shutdown(job->fd, SHUT_WR);
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bufferevent_disable(job->event, EV_WRITE);
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}
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}
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/* Job buffer error callback. */
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void
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job_callback(unused struct bufferevent *bufev, unused short events, void *data)
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{
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struct job *job = data;
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log_debug("job error %p: %s, pid %ld", job, job->cmd, (long) job->pid);
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if (job->pid == -1) {
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if (job->callbackfn != NULL)
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job->callbackfn(job);
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job_free(job);
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} else {
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bufferevent_disable(job->event, EV_READ);
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close(job->fd);
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job->fd = -1;
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}
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}
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/* Job died (waitpid() returned its pid). */
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void
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job_died(struct job *job, int status)
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{
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log_debug("job died %p: %s, pid %ld", job, job->cmd, (long) job->pid);
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job->status = status;
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if (job->fd == -1) {
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if (job->callbackfn != NULL)
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job->callbackfn(job);
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job_free(job);
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} else
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job->pid = -1;
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}
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