Annotation of src/usr.bin/tmux/job.c, Revision 1.28
1.28 ! nicm 1: /* $OpenBSD: job.c,v 1.27 2012/07/10 11:53:01 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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>
1.27 nicm 24: #include <stdlib.h>
1.1 nicm 25: #include <string.h>
26: #include <unistd.h>
27:
28: #include "tmux.h"
29:
30: /*
31: * Job scheduling. Run queued commands in the background and record their
32: * output.
33: */
34:
1.25 nicm 35: void job_callback(struct bufferevent *, short, void *);
36:
1.2 nicm 37: /* All jobs list. */
1.24 nicm 38: struct joblist all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
1.2 nicm 39:
1.25 nicm 40: /* Start a job running, if it isn't already. */
1.1 nicm 41: struct job *
1.25 nicm 42: job_run(const char *cmd,
1.1 nicm 43: void (*callbackfn)(struct job *), void (*freefn)(void *), void *data)
44: {
45: struct job *job;
1.25 nicm 46: struct environ env;
47: pid_t pid;
48: int nullfd, out[2];
1.1 nicm 49:
1.11 nicm 50: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
1.25 nicm 51: return (NULL);
1.1 nicm 52:
1.23 nicm 53: environ_init(&env);
54: environ_copy(&global_environ, &env);
55: server_fill_environ(NULL, &env);
56:
1.25 nicm 57: switch (pid = fork()) {
1.1 nicm 58: case -1:
1.23 nicm 59: environ_free(&env);
1.25 nicm 60: return (NULL);
1.1 nicm 61: case 0: /* child */
1.20 nicm 62: clear_signals(1);
1.16 nicm 63:
1.23 nicm 64: environ_push(&env);
65: environ_free(&env);
1.1 nicm 66:
1.7 nicm 67: if (dup2(out[1], STDOUT_FILENO) == -1)
1.6 nicm 68: fatal("dup2 failed");
1.7 nicm 69: if (out[1] != STDOUT_FILENO)
70: close(out[1]);
71: close(out[0]);
1.6 nicm 72:
1.7 nicm 73: nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
1.1 nicm 74: if (nullfd < 0)
75: fatal("open failed");
76: if (dup2(nullfd, STDIN_FILENO) == -1)
77: fatal("dup2 failed");
78: if (dup2(nullfd, STDERR_FILENO) == -1)
79: fatal("dup2 failed");
80: if (nullfd != STDIN_FILENO && nullfd != STDERR_FILENO)
81: close(nullfd);
82:
1.21 nicm 83: closefrom(STDERR_FILENO + 1);
84:
1.25 nicm 85: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 86: fatal("execl failed");
1.25 nicm 87: }
88:
89: /* parent */
90: environ_free(&env);
91: close(out[1]);
92:
93: job = xmalloc(sizeof *job);
94: job->cmd = xstrdup(cmd);
95: job->pid = pid;
96: job->status = 0;
97:
98: LIST_INSERT_HEAD(&all_jobs, job, lentry);
99:
100: job->callbackfn = callbackfn;
101: job->freefn = freefn;
102: job->data = data;
103:
104: job->fd = out[0];
105: setblocking(job->fd, 0);
106:
107: job->event = bufferevent_new(job->fd, NULL, NULL, job_callback, job);
108: bufferevent_enable(job->event, EV_READ);
109:
110: log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
111: return (job);
112: }
113:
114: /* Kill and free an individual job. */
115: void
116: job_free(struct job *job)
117: {
118: log_debug("free job %p: %s", job, job->cmd);
1.1 nicm 119:
1.25 nicm 120: LIST_REMOVE(job, lentry);
1.27 nicm 121: free(job->cmd);
1.1 nicm 122:
1.25 nicm 123: if (job->freefn != NULL && job->data != NULL)
124: job->freefn(job->data);
125:
126: if (job->pid != -1)
127: kill(job->pid, SIGTERM);
1.26 nicm 128: if (job->event != NULL)
129: bufferevent_free(job->event);
1.25 nicm 130: if (job->fd != -1)
131: close(job->fd);
1.1 nicm 132:
1.27 nicm 133: free(job);
1.11 nicm 134: }
135:
136: /* Job buffer error callback. */
137: void
138: job_callback(unused struct bufferevent *bufev, unused short events, void *data)
139: {
140: struct job *job = data;
141:
1.25 nicm 142: log_debug("job error %p: %s, pid %ld", job, job->cmd, (long) job->pid);
1.11 nicm 143:
1.12 nicm 144: if (job->pid == -1) {
145: if (job->callbackfn != NULL)
146: job->callbackfn(job);
1.25 nicm 147: job_free(job);
148: } else {
149: bufferevent_disable(job->event, EV_READ);
150: close(job->fd);
151: job->fd = -1;
1.12 nicm 152: }
1.11 nicm 153: }
154:
155: /* Job died (waitpid() returned its pid). */
156: void
157: job_died(struct job *job, int status)
158: {
1.25 nicm 159: log_debug("job died %p: %s, pid %ld", job, job->cmd, (long) job->pid);
160:
1.11 nicm 161: job->status = status;
1.14 nicm 162:
1.12 nicm 163: if (job->fd == -1) {
164: if (job->callbackfn != NULL)
165: job->callbackfn(job);
1.25 nicm 166: job_free(job);
167: } else
168: job->pid = -1;
1.1 nicm 169: }
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