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/* $OpenBSD: job.c,v 1.22 2011/01/08 01:52:36 nicm Exp $ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <paths.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
/*
* Job scheduling. Run queued commands in the background and record their
* output.
*/
/* All jobs list. */
struct joblist all_jobs = SLIST_HEAD_INITIALIZER(all_jobs);
RB_GENERATE(jobs, job, entry, job_cmp);
void job_callback(struct bufferevent *, short, void *);
int
job_cmp(struct job *job1, struct job *job2)
{
return (strcmp(job1->cmd, job2->cmd));
}
/* Initialise job tree. */
void
job_tree_init(struct jobs *jobs)
{
RB_INIT(jobs);
}
/* Destroy a job tree. */
void
job_tree_free(struct jobs *jobs)
{
struct job *job;
while (!RB_EMPTY(jobs)) {
job = RB_ROOT(jobs);
RB_REMOVE(jobs, jobs, job);
job_free(job);
}
}
/* Find a job and return it. */
struct job *
job_get(struct jobs *jobs, const char *cmd)
{
struct job job;
job.cmd = (char *) cmd;
return (RB_FIND(jobs, jobs, &job));
}
/* Add a job. */
struct job *
job_add(struct jobs *jobs, int flags, struct client *c, const char *cmd,
void (*callbackfn)(struct job *), void (*freefn)(void *), void *data)
{
struct job *job;
job = xmalloc(sizeof *job);
job->cmd = xstrdup(cmd);
job->pid = -1;
job->status = 0;
job->client = c;
job->fd = -1;
job->event = NULL;
job->callbackfn = callbackfn;
job->freefn = freefn;
job->data = data;
job->flags = flags;
if (jobs != NULL)
RB_INSERT(jobs, jobs, job);
SLIST_INSERT_HEAD(&all_jobs, job, lentry);
return (job);
}
/* Remove job from tree and free. */
void
job_remove(struct jobs *jobs, struct job *job)
{
if (jobs != NULL)
RB_REMOVE(jobs, jobs, job);
job_free(job);
}
/* Kill and free an individual job. */
void
job_free(struct job *job)
{
job_kill(job);
SLIST_REMOVE(&all_jobs, job, job, lentry);
xfree(job->cmd);
if (job->freefn != NULL && job->data != NULL)
job->freefn(job->data);
if (job->fd != -1)
close(job->fd);
if (job->event != NULL)
bufferevent_free(job->event);
xfree(job);
}
/* Start a job running, if it isn't already. */
int
job_run(struct job *job)
{
int nullfd, out[2];
if (job->fd != -1 || job->pid != -1)
return (0);
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
return (-1);
switch (job->pid = fork()) {
case -1:
return (-1);
case 0: /* child */
clear_signals(1);
environ_push(&global_environ);
if (dup2(out[1], STDOUT_FILENO) == -1)
fatal("dup2 failed");
if (out[1] != STDOUT_FILENO)
close(out[1]);
close(out[0]);
nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
if (nullfd < 0)
fatal("open failed");
if (dup2(nullfd, STDIN_FILENO) == -1)
fatal("dup2 failed");
if (dup2(nullfd, STDERR_FILENO) == -1)
fatal("dup2 failed");
if (nullfd != STDIN_FILENO && nullfd != STDERR_FILENO)
close(nullfd);
closefrom(STDERR_FILENO + 1);
execl(_PATH_BSHELL, "sh", "-c", job->cmd, (char *) NULL);
fatal("execl failed");
default: /* parent */
close(out[1]);
job->fd = out[0];
setblocking(job->fd, 0);
if (job->event != NULL)
bufferevent_free(job->event);
job->event =
bufferevent_new(job->fd, NULL, NULL, job_callback, job);
bufferevent_enable(job->event, EV_READ);
return (0);
}
}
/* Job buffer error callback. */
/* ARGSUSED */
void
job_callback(unused struct bufferevent *bufev, unused short events, void *data)
{
struct job *job = data;
bufferevent_disable(job->event, EV_READ);
close(job->fd);
job->fd = -1;
if (job->pid == -1) {
if (job->callbackfn != NULL)
job->callbackfn(job);
if ((!job->flags & JOB_PERSIST))
job_free(job);
}
}
/* Job died (waitpid() returned its pid). */
void
job_died(struct job *job, int status)
{
job->status = status;
job->pid = -1;
if (job->fd == -1) {
if (job->callbackfn != NULL)
job->callbackfn(job);
if ((!job->flags & JOB_PERSIST))
job_free(job);
}
}
/* Kill a job. */
void
job_kill(struct job *job)
{
if (job->pid == -1)
return;
kill(job->pid, SIGTERM);
job->pid = -1;
}
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