Annotation of src/usr.bin/tmux/job.c, Revision 1.42
1.42 ! nicm 1: /* $OpenBSD: job.c,v 1.41 2016/10/10 21:29:23 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:
1.41 nicm 36: static void job_callback(struct bufferevent *, short, void *);
37: static void job_write_callback(struct bufferevent *, void *);
1.25 nicm 38:
1.2 nicm 39: /* All jobs list. */
1.24 nicm 40: struct joblist all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
1.2 nicm 41:
1.25 nicm 42: /* Start a job running, if it isn't already. */
1.1 nicm 43: struct job *
1.38 nicm 44: job_run(const char *cmd, struct session *s, const char *cwd,
1.1 nicm 45: void (*callbackfn)(struct job *), void (*freefn)(void *), void *data)
46: {
47: struct job *job;
1.37 nicm 48: struct environ *env;
1.25 nicm 49: pid_t pid;
50: int nullfd, out[2];
1.38 nicm 51: const char *home;
1.1 nicm 52:
1.11 nicm 53: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
1.25 nicm 54: return (NULL);
1.1 nicm 55:
1.42 ! nicm 56: env = environ_for_session(s);
1.25 nicm 57: switch (pid = fork()) {
1.1 nicm 58: case -1:
1.37 nicm 59: environ_free(env);
1.33 nicm 60: close(out[0]);
61: close(out[1]);
1.25 nicm 62: return (NULL);
1.1 nicm 63: case 0: /* child */
1.20 nicm 64: clear_signals(1);
1.35 nicm 65:
1.38 nicm 66: if (cwd == NULL || chdir(cwd) != 0) {
67: if ((home = find_home()) == NULL || chdir(home) != 0)
68: chdir("/");
69: }
1.16 nicm 70:
1.37 nicm 71: environ_push(env);
72: environ_free(env);
1.1 nicm 73:
1.29 nicm 74: if (dup2(out[1], STDIN_FILENO) == -1)
75: fatal("dup2 failed");
1.7 nicm 76: if (dup2(out[1], STDOUT_FILENO) == -1)
1.6 nicm 77: fatal("dup2 failed");
1.29 nicm 78: if (out[1] != STDIN_FILENO && out[1] != STDOUT_FILENO)
1.7 nicm 79: close(out[1]);
80: close(out[0]);
1.6 nicm 81:
1.7 nicm 82: nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
1.1 nicm 83: if (nullfd < 0)
84: fatal("open failed");
85: if (dup2(nullfd, STDERR_FILENO) == -1)
86: fatal("dup2 failed");
1.29 nicm 87: if (nullfd != STDERR_FILENO)
1.1 nicm 88: close(nullfd);
89:
1.21 nicm 90: closefrom(STDERR_FILENO + 1);
91:
1.25 nicm 92: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 93: fatal("execl failed");
1.25 nicm 94: }
95:
96: /* parent */
1.37 nicm 97: environ_free(env);
1.25 nicm 98: close(out[1]);
99:
100: job = xmalloc(sizeof *job);
1.36 nicm 101: job->state = JOB_RUNNING;
102:
1.25 nicm 103: job->cmd = xstrdup(cmd);
104: job->pid = pid;
105: job->status = 0;
106:
107: LIST_INSERT_HEAD(&all_jobs, job, lentry);
108:
109: job->callbackfn = callbackfn;
110: job->freefn = freefn;
111: job->data = data;
112:
113: job->fd = out[0];
114: setblocking(job->fd, 0);
115:
1.29 nicm 116: job->event = bufferevent_new(job->fd, NULL, job_write_callback,
117: job_callback, job);
1.30 nicm 118: bufferevent_enable(job->event, EV_READ|EV_WRITE);
1.25 nicm 119:
120: log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
121: return (job);
122: }
123:
124: /* Kill and free an individual job. */
125: void
126: job_free(struct job *job)
127: {
128: log_debug("free job %p: %s", job, job->cmd);
1.1 nicm 129:
1.25 nicm 130: LIST_REMOVE(job, lentry);
1.27 nicm 131: free(job->cmd);
1.1 nicm 132:
1.25 nicm 133: if (job->freefn != NULL && job->data != NULL)
134: job->freefn(job->data);
135:
136: if (job->pid != -1)
137: kill(job->pid, SIGTERM);
1.26 nicm 138: if (job->event != NULL)
139: bufferevent_free(job->event);
1.25 nicm 140: if (job->fd != -1)
141: close(job->fd);
1.1 nicm 142:
1.27 nicm 143: free(job);
1.29 nicm 144: }
145:
146: /* Called when output buffer falls below low watermark (default is 0). */
1.41 nicm 147: static void
1.39 nicm 148: job_write_callback(__unused struct bufferevent *bufev, void *data)
1.29 nicm 149: {
150: struct job *job = data;
151: size_t len = EVBUFFER_LENGTH(EVBUFFER_OUTPUT(job->event));
152:
1.31 nicm 153: log_debug("job write %p: %s, pid %ld, output left %zu", job, job->cmd,
1.32 nicm 154: (long) job->pid, len);
1.29 nicm 155:
156: if (len == 0) {
157: shutdown(job->fd, SHUT_WR);
158: bufferevent_disable(job->event, EV_WRITE);
159: }
1.11 nicm 160: }
161:
162: /* Job buffer error callback. */
1.41 nicm 163: static void
1.39 nicm 164: job_callback(__unused struct bufferevent *bufev, __unused short events,
165: void *data)
1.11 nicm 166: {
167: struct job *job = data;
168:
1.25 nicm 169: log_debug("job error %p: %s, pid %ld", job, job->cmd, (long) job->pid);
1.11 nicm 170:
1.36 nicm 171: if (job->state == JOB_DEAD) {
1.12 nicm 172: if (job->callbackfn != NULL)
173: job->callbackfn(job);
1.25 nicm 174: job_free(job);
175: } else {
176: bufferevent_disable(job->event, EV_READ);
1.36 nicm 177: job->state = JOB_CLOSED;
1.12 nicm 178: }
1.11 nicm 179: }
180:
181: /* Job died (waitpid() returned its pid). */
182: void
183: job_died(struct job *job, int status)
184: {
1.25 nicm 185: log_debug("job died %p: %s, pid %ld", job, job->cmd, (long) job->pid);
186:
1.11 nicm 187: job->status = status;
1.14 nicm 188:
1.36 nicm 189: if (job->state == JOB_CLOSED) {
1.12 nicm 190: if (job->callbackfn != NULL)
191: job->callbackfn(job);
1.25 nicm 192: job_free(job);
1.36 nicm 193: } else {
1.25 nicm 194: job->pid = -1;
1.36 nicm 195: job->state = JOB_DEAD;
196: }
1.1 nicm 197: }
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