Annotation of src/usr.bin/tmux/proc.c, Revision 1.14
1.14 ! nicm 1: /* $OpenBSD: proc.c,v 1.13 2017/07/12 12:35:31 nicm Exp $ */
1.1 nicm 2:
3: /*
1.8 nicm 4: * Copyright (c) 2015 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>
20: #include <sys/queue.h>
21: #include <sys/uio.h>
1.6 nicm 22: #include <sys/utsname.h>
1.1 nicm 23:
24: #include <errno.h>
25: #include <event.h>
26: #include <imsg.h>
1.12 nicm 27: #include <signal.h>
1.1 nicm 28: #include <stdlib.h>
29: #include <string.h>
30: #include <unistd.h>
31:
32: #include "tmux.h"
33:
34: struct tmuxproc {
35: const char *name;
36: int exit;
37:
38: void (*signalcb)(int);
1.12 nicm 39:
40: struct event ev_sighup;
41: struct event ev_sigchld;
42: struct event ev_sigcont;
43: struct event ev_sigterm;
44: struct event ev_sigusr1;
45: struct event ev_sigusr2;
46: struct event ev_sigwinch;
1.1 nicm 47: };
48:
49: struct tmuxpeer {
50: struct tmuxproc *parent;
51:
52: struct imsgbuf ibuf;
53: struct event event;
54:
55: int flags;
56: #define PEER_BAD 0x1
57:
58: void (*dispatchcb)(struct imsg *, void *);
1.10 nicm 59: void *arg;
1.1 nicm 60: };
61:
1.2 nicm 62: static int peer_check_version(struct tmuxpeer *, struct imsg *);
63: static void proc_update_event(struct tmuxpeer *);
1.1 nicm 64:
65: static void
1.4 nicm 66: proc_event_cb(__unused int fd, short events, void *arg)
1.1 nicm 67: {
68: struct tmuxpeer *peer = arg;
69: ssize_t n;
70: struct imsg imsg;
71:
72: if (!(peer->flags & PEER_BAD) && (events & EV_READ)) {
1.7 claudio 73: if (((n = imsg_read(&peer->ibuf)) == -1 && errno != EAGAIN) ||
74: n == 0) {
1.1 nicm 75: peer->dispatchcb(NULL, peer->arg);
76: return;
77: }
78: for (;;) {
79: if ((n = imsg_get(&peer->ibuf, &imsg)) == -1) {
80: peer->dispatchcb(NULL, peer->arg);
81: return;
82: }
83: if (n == 0)
84: break;
85: log_debug("peer %p message %d", peer, imsg.hdr.type);
86:
1.2 nicm 87: if (peer_check_version(peer, &imsg) != 0) {
1.1 nicm 88: if (imsg.fd != -1)
89: close(imsg.fd);
90: imsg_free(&imsg);
91: break;
92: }
93:
94: peer->dispatchcb(&imsg, peer->arg);
95: imsg_free(&imsg);
96: }
97: }
98:
99: if (events & EV_WRITE) {
100: if (msgbuf_write(&peer->ibuf.w) <= 0 && errno != EAGAIN) {
101: peer->dispatchcb(NULL, peer->arg);
102: return;
103: }
104: }
105:
106: if ((peer->flags & PEER_BAD) && peer->ibuf.w.queued == 0) {
107: peer->dispatchcb(NULL, peer->arg);
108: return;
109: }
110:
111: proc_update_event(peer);
112: }
113:
114: static void
1.4 nicm 115: proc_signal_cb(int signo, __unused short events, void *arg)
1.1 nicm 116: {
117: struct tmuxproc *tp = arg;
118:
119: tp->signalcb(signo);
1.2 nicm 120: }
121:
122: static int
123: peer_check_version(struct tmuxpeer *peer, struct imsg *imsg)
124: {
125: int version;
126:
127: version = imsg->hdr.peerid & 0xff;
128: if (imsg->hdr.type != MSG_VERSION && version != PROTOCOL_VERSION) {
129: log_debug("peer %p bad version %d", peer, version);
130:
131: proc_send(peer, MSG_VERSION, -1, NULL, 0);
132: peer->flags |= PEER_BAD;
133:
134: return (-1);
135: }
136: return (0);
1.1 nicm 137: }
138:
139: static void
140: proc_update_event(struct tmuxpeer *peer)
141: {
142: short events;
143:
144: event_del(&peer->event);
145:
146: events = EV_READ;
147: if (peer->ibuf.w.queued > 0)
148: events |= EV_WRITE;
149: event_set(&peer->event, peer->ibuf.fd, events, proc_event_cb, peer);
150:
151: event_add(&peer->event, NULL);
152: }
153:
154: int
155: proc_send(struct tmuxpeer *peer, enum msgtype type, int fd, const void *buf,
156: size_t len)
157: {
158: struct imsgbuf *ibuf = &peer->ibuf;
159: void *vp = (void *)buf;
160: int retval;
161:
162: if (peer->flags & PEER_BAD)
163: return (-1);
164: log_debug("sending message %d to peer %p (%zu bytes)", type, peer, len);
165:
166: retval = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, fd, vp, len);
167: if (retval != 1)
168: return (-1);
169: proc_update_event(peer);
170: return (0);
171: }
172:
173: struct tmuxproc *
1.12 nicm 174: proc_start(const char *name)
1.1 nicm 175: {
176: struct tmuxproc *tp;
1.6 nicm 177: struct utsname u;
1.1 nicm 178:
1.5 nicm 179: log_open(name);
1.1 nicm 180: setproctitle("%s (%s)", name, socket_path);
181:
1.6 nicm 182: if (uname(&u) < 0)
183: memset(&u, 0, sizeof u);
184:
1.1 nicm 185: log_debug("%s started (%ld): socket %s, protocol %d", name,
186: (long)getpid(), socket_path, PROTOCOL_VERSION);
1.6 nicm 187: log_debug("on %s %s %s; libevent %s (%s)", u.sysname, u.release,
188: u.version, event_get_version(), event_get_method());
1.1 nicm 189:
190: tp = xcalloc(1, sizeof *tp);
191: tp->name = xstrdup(name);
192:
193: return (tp);
194: }
195:
196: void
197: proc_loop(struct tmuxproc *tp, int (*loopcb)(void))
198: {
199: log_debug("%s loop enter", tp->name);
200: do
201: event_loop(EVLOOP_ONCE);
202: while (!tp->exit && (loopcb == NULL || !loopcb ()));
203: log_debug("%s loop exit", tp->name);
204: }
205:
206: void
207: proc_exit(struct tmuxproc *tp)
208: {
209: tp->exit = 1;
1.12 nicm 210: }
211:
212: void
213: proc_set_signals(struct tmuxproc *tp, void (*signalcb)(int))
214: {
215: struct sigaction sa;
216:
217: tp->signalcb = signalcb;
218:
219: memset(&sa, 0, sizeof sa);
220: sigemptyset(&sa.sa_mask);
221: sa.sa_flags = SA_RESTART;
222: sa.sa_handler = SIG_IGN;
223:
224: sigaction(SIGINT, &sa, NULL);
225: sigaction(SIGPIPE, &sa, NULL);
226: sigaction(SIGTSTP, &sa, NULL);
227:
228: signal_set(&tp->ev_sighup, SIGHUP, proc_signal_cb, tp);
229: signal_add(&tp->ev_sighup, NULL);
230: signal_set(&tp->ev_sigchld, SIGCHLD, proc_signal_cb, tp);
231: signal_add(&tp->ev_sigchld, NULL);
232: signal_set(&tp->ev_sigcont, SIGCONT, proc_signal_cb, tp);
233: signal_add(&tp->ev_sigcont, NULL);
234: signal_set(&tp->ev_sigterm, SIGTERM, proc_signal_cb, tp);
235: signal_add(&tp->ev_sigterm, NULL);
236: signal_set(&tp->ev_sigusr1, SIGUSR1, proc_signal_cb, tp);
237: signal_add(&tp->ev_sigusr1, NULL);
238: signal_set(&tp->ev_sigusr2, SIGUSR2, proc_signal_cb, tp);
239: signal_add(&tp->ev_sigusr2, NULL);
240: signal_set(&tp->ev_sigwinch, SIGWINCH, proc_signal_cb, tp);
241: signal_add(&tp->ev_sigwinch, NULL);
242: }
243:
244: void
245: proc_clear_signals(struct tmuxproc *tp)
246: {
247: struct sigaction sa;
248:
249: memset(&sa, 0, sizeof sa);
250: sigemptyset(&sa.sa_mask);
251: sa.sa_flags = SA_RESTART;
252: sa.sa_handler = SIG_DFL;
253:
254: sigaction(SIGINT, &sa, NULL);
255: sigaction(SIGPIPE, &sa, NULL);
256: sigaction(SIGTSTP, &sa, NULL);
257:
1.14 ! nicm 258: signal_del(&tp->ev_sighup);
! 259: signal_del(&tp->ev_sigchld);
! 260: signal_del(&tp->ev_sigcont);
! 261: signal_del(&tp->ev_sigterm);
! 262: signal_del(&tp->ev_sigusr1);
! 263: signal_del(&tp->ev_sigusr2);
! 264: signal_del(&tp->ev_sigwinch);
1.1 nicm 265: }
266:
267: struct tmuxpeer *
268: proc_add_peer(struct tmuxproc *tp, int fd,
269: void (*dispatchcb)(struct imsg *, void *), void *arg)
270: {
271: struct tmuxpeer *peer;
272:
273: peer = xcalloc(1, sizeof *peer);
274: peer->parent = tp;
275:
276: peer->dispatchcb = dispatchcb;
277: peer->arg = arg;
278:
279: imsg_init(&peer->ibuf, fd);
280: event_set(&peer->event, fd, EV_READ, proc_event_cb, peer);
281:
282: log_debug("add peer %p: %d (%p)", peer, fd, arg);
283:
284: proc_update_event(peer);
285: return (peer);
286: }
287:
288: void
289: proc_remove_peer(struct tmuxpeer *peer)
290: {
291: log_debug("remove peer %p", peer);
292:
293: event_del(&peer->event);
294: imsg_clear(&peer->ibuf);
295:
296: close(peer->ibuf.fd);
297: free(peer);
298: }
299:
300: void
301: proc_kill_peer(struct tmuxpeer *peer)
302: {
303: peer->flags |= PEER_BAD;
1.9 nicm 304: }
305:
306: void
307: proc_toggle_log(struct tmuxproc *tp)
308: {
309: log_toggle(tp->name);
1.1 nicm 310: }
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