mirror of
https://github.com/tmux/tmux.git
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325 lines
7.0 KiB
C
325 lines
7.0 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
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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 <signal.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 "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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static void job_read_callback(struct bufferevent *, void *);
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static void job_write_callback(struct bufferevent *, void *);
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static void job_error_callback(struct bufferevent *, short, void *);
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/* A single job. */
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struct job {
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enum {
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JOB_RUNNING,
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JOB_DEAD,
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JOB_CLOSED
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} state;
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int flags;
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char *cmd;
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pid_t pid;
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int status;
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int fd;
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struct bufferevent *event;
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job_update_cb updatecb;
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job_complete_cb completecb;
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job_free_cb freecb;
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void *data;
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LIST_ENTRY(job) entry;
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};
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/* All jobs list. */
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static LIST_HEAD(joblist, job) 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, const char *cwd,
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job_update_cb updatecb, job_complete_cb completecb, job_free_cb freecb,
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void *data, int flags)
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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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const char *home;
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sigset_t set, oldset;
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
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return (NULL);
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log_debug("%s: cmd=%s, cwd=%s", __func__, cmd, cwd == NULL ? "" : cwd);
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/*
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* Do not set TERM during .tmux.conf, it is nice to be able to use
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* if-shell to decide on default-terminal based on outside TERM.
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*/
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env = environ_for_session(s, !cfg_finished);
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sigfillset(&set);
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sigprocmask(SIG_BLOCK, &set, &oldset);
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switch (pid = fork()) {
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case -1:
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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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:
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proc_clear_signals(server_proc, 1);
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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if (cwd == NULL || chdir(cwd) != 0) {
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if ((home = find_home()) == NULL || chdir(home) != 0)
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chdir("/");
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}
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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 == -1)
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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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sigprocmask(SIG_SETMASK, &oldset, NULL);
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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->state = JOB_RUNNING;
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job->flags = flags;
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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, entry);
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job->updatecb = updatecb;
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job->completecb = completecb;
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job->freecb = freecb;
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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, job_read_callback,
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job_write_callback, job_error_callback, job);
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if (job->event == NULL)
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fatalx("out of memory");
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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, entry);
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free(job->cmd);
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if (job->freecb != NULL && job->data != NULL)
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job->freecb(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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/* Job buffer read callback. */
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static void
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job_read_callback(__unused struct bufferevent *bufev, void *data)
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{
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struct job *job = data;
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if (job->updatecb != NULL)
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job->updatecb(job);
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}
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/*
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* Job buffer write callback. Fired when the buffer falls below watermark
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* (default is empty). If all the data has been written, disable the write
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* event.
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*/
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static 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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static void
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job_error_callback(__unused struct bufferevent *bufev, __unused short events,
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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->state == JOB_DEAD) {
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if (job->completecb != NULL)
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job->completecb(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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job->state = JOB_CLOSED;
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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_check_died(pid_t pid, int status)
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{
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struct job *job;
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LIST_FOREACH(job, &all_jobs, entry) {
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if (pid == job->pid)
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break;
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}
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if (job == NULL)
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return;
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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->state == JOB_CLOSED) {
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if (job->completecb != NULL)
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job->completecb(job);
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job_free(job);
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} else {
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job->pid = -1;
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job->state = JOB_DEAD;
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}
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}
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/* Get job status. */
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int
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job_get_status(struct job *job)
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{
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return (job->status);
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}
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/* Get job data. */
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void *
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job_get_data(struct job *job)
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{
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return (job->data);
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}
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/* Get job event. */
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struct bufferevent *
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job_get_event(struct job *job)
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{
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return (job->event);
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}
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/* Kill all jobs. */
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void
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job_kill_all(void)
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{
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struct job *job;
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LIST_FOREACH(job, &all_jobs, entry) {
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if (job->pid != -1)
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kill(job->pid, SIGTERM);
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}
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}
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/* Are any jobs still running? */
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int
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job_still_running(void)
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{
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struct job *job;
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LIST_FOREACH(job, &all_jobs, entry) {
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if ((~job->flags & JOB_NOWAIT) && job->state == JOB_RUNNING)
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return (1);
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}
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return (0);
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}
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/* Print job summary. */
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void
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job_print_summary(struct cmdq_item *item, int blank)
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{
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struct job *job;
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u_int n = 0;
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LIST_FOREACH(job, &all_jobs, entry) {
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if (blank) {
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cmdq_print(item, "%s", "");
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blank = 0;
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}
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cmdq_print(item, "Job %u: %s [fd=%d, pid=%ld, status=%d]",
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n, job->cmd, job->fd, (long)job->pid, job->status);
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n++;
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}
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}
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