Annotation of src/usr.bin/tmux/job.c, Revision 1.44
1.44 ! nicm 1: /* $OpenBSD: job.c,v 1.43 2017/04/20 09:20:22 nicm Exp $ */
1.1 nicm 2:
3: /*
1.40 nicm 4: * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
1.11 nicm 20: #include <sys/socket.h>
1.1 nicm 21:
22: #include <fcntl.h>
23: #include <paths.h>
1.34 nicm 24: #include <signal.h>
1.27 nicm 25: #include <stdlib.h>
1.1 nicm 26: #include <string.h>
27: #include <unistd.h>
28:
29: #include "tmux.h"
30:
31: /*
32: * Job scheduling. Run queued commands in the background and record their
33: * output.
34: */
35:
1.43 nicm 36: static void job_read_callback(struct bufferevent *, void *);
1.41 nicm 37: static void job_write_callback(struct bufferevent *, void *);
1.43 nicm 38: static void job_error_callback(struct bufferevent *, short, void *);
1.25 nicm 39:
1.2 nicm 40: /* All jobs list. */
1.24 nicm 41: struct joblist all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
1.2 nicm 42:
1.25 nicm 43: /* Start a job running, if it isn't already. */
1.1 nicm 44: struct job *
1.38 nicm 45: job_run(const char *cmd, struct session *s, const char *cwd,
1.43 nicm 46: job_update_cb updatecb, job_complete_cb completecb, job_free_cb freecb,
47: void *data)
1.1 nicm 48: {
49: struct job *job;
1.37 nicm 50: struct environ *env;
1.25 nicm 51: pid_t pid;
52: int nullfd, out[2];
1.38 nicm 53: const char *home;
1.1 nicm 54:
1.11 nicm 55: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
1.25 nicm 56: return (NULL);
1.1 nicm 57:
1.44 ! nicm 58: /*
! 59: * Do not set TERM during .tmux.conf, it is nice to be able to use
! 60: * if-shell to decide on default-terminal based on outside TERM.
! 61: */
! 62: env = environ_for_session(s, !cfg_finished);
! 63:
1.25 nicm 64: switch (pid = fork()) {
1.1 nicm 65: case -1:
1.37 nicm 66: environ_free(env);
1.33 nicm 67: close(out[0]);
68: close(out[1]);
1.25 nicm 69: return (NULL);
1.1 nicm 70: case 0: /* child */
1.20 nicm 71: clear_signals(1);
1.35 nicm 72:
1.38 nicm 73: if (cwd == NULL || chdir(cwd) != 0) {
74: if ((home = find_home()) == NULL || chdir(home) != 0)
75: chdir("/");
76: }
1.16 nicm 77:
1.37 nicm 78: environ_push(env);
79: environ_free(env);
1.1 nicm 80:
1.29 nicm 81: if (dup2(out[1], STDIN_FILENO) == -1)
82: fatal("dup2 failed");
1.7 nicm 83: if (dup2(out[1], STDOUT_FILENO) == -1)
1.6 nicm 84: fatal("dup2 failed");
1.29 nicm 85: if (out[1] != STDIN_FILENO && out[1] != STDOUT_FILENO)
1.7 nicm 86: close(out[1]);
87: close(out[0]);
1.6 nicm 88:
1.7 nicm 89: nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
1.1 nicm 90: if (nullfd < 0)
91: fatal("open failed");
92: if (dup2(nullfd, STDERR_FILENO) == -1)
93: fatal("dup2 failed");
1.29 nicm 94: if (nullfd != STDERR_FILENO)
1.1 nicm 95: close(nullfd);
96:
1.21 nicm 97: closefrom(STDERR_FILENO + 1);
98:
1.25 nicm 99: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 100: fatal("execl failed");
1.25 nicm 101: }
102:
103: /* parent */
1.37 nicm 104: environ_free(env);
1.25 nicm 105: close(out[1]);
106:
107: job = xmalloc(sizeof *job);
1.36 nicm 108: job->state = JOB_RUNNING;
109:
1.25 nicm 110: job->cmd = xstrdup(cmd);
111: job->pid = pid;
112: job->status = 0;
113:
1.43 nicm 114: LIST_INSERT_HEAD(&all_jobs, job, entry);
1.25 nicm 115:
1.43 nicm 116: job->updatecb = updatecb;
117: job->completecb = completecb;
118: job->freecb = freecb;
1.25 nicm 119: job->data = data;
120:
121: job->fd = out[0];
122: setblocking(job->fd, 0);
123:
1.43 nicm 124: job->event = bufferevent_new(job->fd, job_read_callback,
125: job_write_callback, job_error_callback, job);
1.30 nicm 126: bufferevent_enable(job->event, EV_READ|EV_WRITE);
1.25 nicm 127:
128: log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
129: return (job);
130: }
131:
132: /* Kill and free an individual job. */
133: void
134: job_free(struct job *job)
135: {
136: log_debug("free job %p: %s", job, job->cmd);
1.1 nicm 137:
1.43 nicm 138: LIST_REMOVE(job, entry);
1.27 nicm 139: free(job->cmd);
1.1 nicm 140:
1.43 nicm 141: if (job->freecb != NULL && job->data != NULL)
142: job->freecb(job->data);
1.25 nicm 143:
144: if (job->pid != -1)
145: kill(job->pid, SIGTERM);
1.26 nicm 146: if (job->event != NULL)
147: bufferevent_free(job->event);
1.25 nicm 148: if (job->fd != -1)
149: close(job->fd);
1.1 nicm 150:
1.27 nicm 151: free(job);
1.29 nicm 152: }
153:
1.43 nicm 154: /* Job buffer read callback. */
155: static void
156: job_read_callback(__unused struct bufferevent *bufev, void *data)
157: {
158: struct job *job = data;
159:
160: if (job->updatecb != NULL)
161: job->updatecb (job);
162: }
163:
164: /*
165: * Job buffer write callback. Fired when the buffer falls below watermark
166: * (default is empty). If all the data has been written, disable the write
167: * event.
168: */
1.41 nicm 169: static void
1.39 nicm 170: job_write_callback(__unused struct bufferevent *bufev, void *data)
1.29 nicm 171: {
172: struct job *job = data;
173: size_t len = EVBUFFER_LENGTH(EVBUFFER_OUTPUT(job->event));
174:
1.31 nicm 175: log_debug("job write %p: %s, pid %ld, output left %zu", job, job->cmd,
1.32 nicm 176: (long) job->pid, len);
1.29 nicm 177:
178: if (len == 0) {
179: shutdown(job->fd, SHUT_WR);
180: bufferevent_disable(job->event, EV_WRITE);
181: }
1.11 nicm 182: }
183:
184: /* Job buffer error callback. */
1.41 nicm 185: static void
1.43 nicm 186: job_error_callback(__unused struct bufferevent *bufev, __unused short events,
1.39 nicm 187: void *data)
1.11 nicm 188: {
189: struct job *job = data;
190:
1.25 nicm 191: log_debug("job error %p: %s, pid %ld", job, job->cmd, (long) job->pid);
1.11 nicm 192:
1.36 nicm 193: if (job->state == JOB_DEAD) {
1.43 nicm 194: if (job->completecb != NULL)
195: job->completecb(job);
1.25 nicm 196: job_free(job);
197: } else {
198: bufferevent_disable(job->event, EV_READ);
1.36 nicm 199: job->state = JOB_CLOSED;
1.12 nicm 200: }
1.11 nicm 201: }
202:
203: /* Job died (waitpid() returned its pid). */
204: void
205: job_died(struct job *job, int status)
206: {
1.25 nicm 207: log_debug("job died %p: %s, pid %ld", job, job->cmd, (long) job->pid);
208:
1.11 nicm 209: job->status = status;
1.14 nicm 210:
1.36 nicm 211: if (job->state == JOB_CLOSED) {
1.43 nicm 212: if (job->completecb != NULL)
213: job->completecb(job);
1.25 nicm 214: job_free(job);
1.36 nicm 215: } else {
1.25 nicm 216: job->pid = -1;
1.36 nicm 217: job->state = JOB_DEAD;
218: }
1.1 nicm 219: }
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