mirror of
https://github.com/tmux/tmux.git
synced 2025-09-01 20:57:00 +00:00
Break the common process set up, event loop and imsg dispatch code
between server and client out into a separate internal API. This will make it easier to add another process.
This commit is contained in:
nicm
509
client.c
509
client.c
@ -26,6 +26,7 @@
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <imsg.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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@ -33,10 +34,10 @@
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#include "tmux.h"
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int client_flags;
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struct imsgbuf client_ibuf;
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struct event client_event;
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struct event client_stdin;
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struct tmuxproc *client_proc;
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struct tmuxpeer *client_peer;
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int client_flags;
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struct event client_stdin;
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enum {
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CLIENT_EXIT_NONE,
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CLIENT_EXIT_DETACHED,
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@ -47,24 +48,21 @@ enum {
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CLIENT_EXIT_EXITED,
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CLIENT_EXIT_SERVER_EXITED,
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} client_exitreason = CLIENT_EXIT_NONE;
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int client_exitval;
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enum msgtype client_exittype;
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const char *client_exitsession;
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int client_attached;
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int client_exitval;
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enum msgtype client_exittype;
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const char *client_exitsession;
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int client_attached;
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__dead void client_exec(const char *);
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int client_get_lock(char *);
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int client_connect(struct event_base *, char *, int);
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void client_send_identify(const char *, const char *);
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int client_write_one(enum msgtype, int, const void *, size_t);
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int client_write_server(enum msgtype, const void *, size_t);
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void client_update_event(void);
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void client_signal(int, short, void *);
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void client_stdin_callback(int, short, void *);
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void client_write(int, const char *, size_t);
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void client_callback(int, short, void *);
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int client_dispatch_attached(void);
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int client_dispatch_wait(void);
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void client_signal(int);
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void client_dispatch(struct imsg *, void *);
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void client_dispatch_attached(struct imsg *);
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void client_dispatch_wait(struct imsg *);
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const char *client_exit_message(void);
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/*
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@ -222,6 +220,9 @@ client_main(struct event_base *base, int argc, char **argv, int flags)
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struct termios tio, saved_tio;
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size_t size;
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/* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
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signal(SIGCHLD, SIG_IGN);
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/* Save the flags. */
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client_flags = flags;
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@ -254,13 +255,6 @@ client_main(struct event_base *base, int argc, char **argv, int flags)
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cmd_list_free(cmdlist);
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}
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/* Set process title, log and signals now this is the client. */
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setproctitle("client (%s)", socket_path);
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logfile("client");
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/* Establish signal handlers. */
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set_signals(client_signal);
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/* Initialize the client socket and start the server. */
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fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
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if (fd == -1) {
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@ -274,6 +268,10 @@ client_main(struct event_base *base, int argc, char **argv, int flags)
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return (1);
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}
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/* Build process state. */
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client_proc = proc_start("client", base, 0, client_signal);
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client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
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/* Save these before pledge(). */
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if ((cwd = getcwd(path, sizeof path)) == NULL)
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cwd = "/";
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@ -298,10 +296,6 @@ client_main(struct event_base *base, int argc, char **argv, int flags)
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options_free(&global_w_options);
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environ_free(&global_environ);
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/* Create imsg. */
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imsg_init(&client_ibuf, fd);
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event_set(&client_event, fd, EV_READ, client_callback, NULL);
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/* Create stdin handler. */
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setblocking(STDIN_FILENO, 0);
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event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
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@ -345,18 +339,17 @@ client_main(struct event_base *base, int argc, char **argv, int flags)
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size += sizeof *data;
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/* Send the command. */
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if (client_write_server(msg, data, size) != 0) {
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if (proc_send(client_peer, msg, -1, data, size) != 0) {
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fprintf(stderr, "failed to send command\n");
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free(data);
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return (1);
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}
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free(data);
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} else if (msg == MSG_SHELL)
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client_write_server(msg, NULL, 0);
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proc_send(client_peer, msg, -1, NULL, 0);
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/* Set the event and dispatch. */
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client_update_event();
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event_dispatch();
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/* Start main loop. */
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proc_loop(client_proc, NULL);
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/* Print the exit message, if any, and exit. */
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if (client_attached) {
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@ -388,144 +381,29 @@ client_send_identify(const char *ttynam, const char *cwd)
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int fd, flags = client_flags;
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pid_t pid;
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client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
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proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
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if ((s = getenv("TERM")) == NULL)
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s = "";
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client_write_one(MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
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proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
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client_write_one(MSG_IDENTIFY_TTYNAME, -1, ttynam, strlen(ttynam) + 1);
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client_write_one(MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
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proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam, strlen(ttynam) + 1);
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proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
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if ((fd = dup(STDIN_FILENO)) == -1)
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fatal("dup failed");
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client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
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proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
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pid = getpid();
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client_write_one(MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
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proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
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for (ss = environ; *ss != NULL; ss++) {
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sslen = strlen(*ss) + 1;
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if (sslen <= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
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client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
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proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
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}
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client_write_one(MSG_IDENTIFY_DONE, -1, NULL, 0);
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}
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/* Helper to send one message. */
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int
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client_write_one(enum msgtype type, int fd, const void *buf, size_t len)
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{
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int retval;
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retval = imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, fd,
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(void *)buf, len);
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if (retval != 1)
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return (-1);
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return (0);
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}
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/* Write a message to the server without a file descriptor. */
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int
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client_write_server(enum msgtype type, const void *buf, size_t len)
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{
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int retval;
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retval = client_write_one(type, -1, buf, len);
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if (retval == 0)
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client_update_event();
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return (retval);
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}
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/* Update client event based on whether it needs to read or read and write. */
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void
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client_update_event(void)
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{
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short events;
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event_del(&client_event);
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events = EV_READ;
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if (client_ibuf.w.queued > 0)
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events |= EV_WRITE;
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event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
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event_add(&client_event, NULL);
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}
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/* Callback to handle signals in the client. */
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void
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client_signal(int sig, unused short events, unused void *arg)
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{
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struct sigaction sigact;
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int status;
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if (sig == SIGCHLD)
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waitpid(WAIT_ANY, &status, WNOHANG);
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else if (!client_attached) {
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if (sig == SIGTERM)
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event_loopexit(NULL);
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} else {
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switch (sig) {
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case SIGHUP:
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client_exitreason = CLIENT_EXIT_LOST_TTY;
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGTERM:
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client_exitreason = CLIENT_EXIT_TERMINATED;
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGWINCH:
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client_write_server(MSG_RESIZE, NULL, 0);
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break;
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case SIGCONT:
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memset(&sigact, 0, sizeof sigact);
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigact.sa_handler = SIG_IGN;
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if (sigaction(SIGTSTP, &sigact, NULL) != 0)
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fatal("sigaction failed");
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client_write_server(MSG_WAKEUP, NULL, 0);
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break;
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}
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}
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client_update_event();
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}
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/* Callback for client imsg read events. */
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void
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client_callback(unused int fd, short events, unused void *arg)
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{
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ssize_t n;
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int retval;
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if (events & EV_READ) {
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if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
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goto lost_server;
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if (client_attached)
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retval = client_dispatch_attached();
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else
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retval = client_dispatch_wait();
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if (retval != 0) {
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event_loopexit(NULL);
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return;
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}
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}
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if (events & EV_WRITE) {
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if (msgbuf_write(&client_ibuf.w) <= 0 && errno != EAGAIN)
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goto lost_server;
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}
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client_update_event();
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return;
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lost_server:
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client_exitreason = CLIENT_EXIT_LOST_SERVER;
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client_exitval = 1;
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event_loopexit(NULL);
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proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
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}
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/* Callback for client stdin read events. */
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@ -538,10 +416,9 @@ client_stdin_callback(unused int fd, unused short events, unused void *arg)
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if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
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return;
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client_write_server(MSG_STDIN, &data, sizeof data);
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proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
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if (data.size <= 0)
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event_del(&client_stdin);
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client_update_event();
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}
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/* Force write to file descriptor. */
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@ -591,13 +468,65 @@ client_exec(const char *shell)
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fatal("execl failed");
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}
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/* Dispatch imsgs when in wait state (before MSG_READY). */
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int
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client_dispatch_wait(void)
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/* Callback to handle signals in the client. */
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void
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client_signal(int sig)
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{
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struct sigaction sigact;
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int status;
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if (sig == SIGCHLD)
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waitpid(WAIT_ANY, &status, WNOHANG);
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else if (!client_attached) {
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if (sig == SIGTERM)
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proc_exit(client_proc);
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} else {
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switch (sig) {
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case SIGHUP:
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client_exitreason = CLIENT_EXIT_LOST_TTY;
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client_exitval = 1;
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proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
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break;
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case SIGTERM:
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client_exitreason = CLIENT_EXIT_TERMINATED;
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client_exitval = 1;
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proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
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break;
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case SIGWINCH:
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proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
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break;
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case SIGCONT:
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memset(&sigact, 0, sizeof sigact);
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigact.sa_handler = SIG_IGN;
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if (sigaction(SIGTSTP, &sigact, NULL) != 0)
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fatal("sigaction failed");
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proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
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break;
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}
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}
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}
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/* Callback for client read events. */
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void
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client_dispatch(struct imsg *imsg, unused void *arg)
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{
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if (imsg == NULL) {
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client_exitreason = CLIENT_EXIT_LOST_SERVER;
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client_exitval = 1;
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} else if (client_attached)
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client_dispatch_attached(imsg);
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else
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client_dispatch_wait(imsg);
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}
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/* Dispatch imsgs when in wait state (before MSG_READY). */
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void
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client_dispatch_wait(struct imsg *imsg)
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{
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struct imsg imsg;
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char *data;
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ssize_t n, datalen;
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ssize_t datalen;
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struct msg_stdout_data stdoutdata;
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struct msg_stderr_data stderrdata;
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int retval;
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@ -615,163 +544,141 @@ client_dispatch_wait(void)
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pledge_applied = 1;
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};
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for (;;) {
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if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
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fatalx("imsg_get failed");
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if (n == 0)
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return (0);
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data = imsg->data;
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datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
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|
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data = imsg.data;
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datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
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|
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log_debug("got %u from server", imsg.hdr.type);
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switch (imsg.hdr.type) {
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case MSG_EXIT:
|
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case MSG_SHUTDOWN:
|
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if (datalen != sizeof retval && datalen != 0)
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fatalx("bad MSG_EXIT size");
|
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if (datalen == sizeof retval) {
|
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memcpy(&retval, data, sizeof retval);
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client_exitval = retval;
|
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}
|
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imsg_free(&imsg);
|
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return (-1);
|
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case MSG_READY:
|
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if (datalen != 0)
|
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fatalx("bad MSG_READY size");
|
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|
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event_del(&client_stdin);
|
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client_attached = 1;
|
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client_write_server(MSG_RESIZE, NULL, 0);
|
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break;
|
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case MSG_STDIN:
|
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if (datalen != 0)
|
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fatalx("bad MSG_STDIN size");
|
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|
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event_add(&client_stdin, NULL);
|
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break;
|
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case MSG_STDOUT:
|
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if (datalen != sizeof stdoutdata)
|
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fatalx("bad MSG_STDOUT size");
|
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memcpy(&stdoutdata, data, sizeof stdoutdata);
|
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|
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client_write(STDOUT_FILENO, stdoutdata.data,
|
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stdoutdata.size);
|
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break;
|
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case MSG_STDERR:
|
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if (datalen != sizeof stderrdata)
|
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fatalx("bad MSG_STDERR size");
|
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memcpy(&stderrdata, data, sizeof stderrdata);
|
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|
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client_write(STDERR_FILENO, stderrdata.data,
|
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stderrdata.size);
|
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break;
|
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case MSG_VERSION:
|
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if (datalen != 0)
|
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fatalx("bad MSG_VERSION size");
|
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|
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fprintf(stderr, "protocol version mismatch "
|
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"(client %d, server %u)\n", PROTOCOL_VERSION,
|
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imsg.hdr.peerid);
|
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client_exitval = 1;
|
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|
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imsg_free(&imsg);
|
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return (-1);
|
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case MSG_SHELL:
|
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if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_SHELL string");
|
||||
|
||||
clear_signals(0);
|
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client_exec(data);
|
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/* NOTREACHED */
|
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case MSG_DETACH:
|
||||
case MSG_DETACHKILL:
|
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client_write_server(MSG_EXITING, NULL, 0);
|
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break;
|
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case MSG_EXITED:
|
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imsg_free(&imsg);
|
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return (-1);
|
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switch (imsg->hdr.type) {
|
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case MSG_EXIT:
|
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case MSG_SHUTDOWN:
|
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if (datalen != sizeof retval && datalen != 0)
|
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fatalx("bad MSG_EXIT size");
|
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if (datalen == sizeof retval) {
|
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memcpy(&retval, data, sizeof retval);
|
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client_exitval = retval;
|
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}
|
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proc_exit(client_proc);
|
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break;
|
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case MSG_READY:
|
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if (datalen != 0)
|
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fatalx("bad MSG_READY size");
|
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|
||||
imsg_free(&imsg);
|
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event_del(&client_stdin);
|
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client_attached = 1;
|
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proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
|
||||
break;
|
||||
case MSG_STDIN:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_STDIN size");
|
||||
|
||||
event_add(&client_stdin, NULL);
|
||||
break;
|
||||
case MSG_STDOUT:
|
||||
if (datalen != sizeof stdoutdata)
|
||||
fatalx("bad MSG_STDOUT size");
|
||||
memcpy(&stdoutdata, data, sizeof stdoutdata);
|
||||
|
||||
client_write(STDOUT_FILENO, stdoutdata.data,
|
||||
stdoutdata.size);
|
||||
break;
|
||||
case MSG_STDERR:
|
||||
if (datalen != sizeof stderrdata)
|
||||
fatalx("bad MSG_STDERR size");
|
||||
memcpy(&stderrdata, data, sizeof stderrdata);
|
||||
|
||||
client_write(STDERR_FILENO, stderrdata.data,
|
||||
stderrdata.size);
|
||||
break;
|
||||
case MSG_VERSION:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_VERSION size");
|
||||
|
||||
fprintf(stderr, "protocol version mismatch "
|
||||
"(client %d, server %u)\n", PROTOCOL_VERSION,
|
||||
imsg->hdr.peerid);
|
||||
client_exitval = 1;
|
||||
proc_exit(client_proc);
|
||||
break;
|
||||
case MSG_SHELL:
|
||||
if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_SHELL string");
|
||||
|
||||
clear_signals(0);
|
||||
client_exec(data);
|
||||
/* NOTREACHED */
|
||||
case MSG_DETACH:
|
||||
case MSG_DETACHKILL:
|
||||
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
||||
break;
|
||||
case MSG_EXITED:
|
||||
proc_exit(client_proc);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Dispatch imsgs in attached state (after MSG_READY). */
|
||||
int
|
||||
client_dispatch_attached(void)
|
||||
void
|
||||
client_dispatch_attached(struct imsg *imsg)
|
||||
{
|
||||
struct imsg imsg;
|
||||
struct sigaction sigact;
|
||||
char *data;
|
||||
ssize_t n, datalen;
|
||||
ssize_t datalen;
|
||||
|
||||
for (;;) {
|
||||
if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
|
||||
fatalx("imsg_get failed");
|
||||
if (n == 0)
|
||||
return (0);
|
||||
data = imsg->data;
|
||||
datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
|
||||
|
||||
data = imsg.data;
|
||||
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
|
||||
switch (imsg->hdr.type) {
|
||||
case MSG_DETACH:
|
||||
case MSG_DETACHKILL:
|
||||
if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_DETACH string");
|
||||
|
||||
log_debug("got %u from server", imsg.hdr.type);
|
||||
switch (imsg.hdr.type) {
|
||||
case MSG_DETACH:
|
||||
case MSG_DETACHKILL:
|
||||
if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_DETACH string");
|
||||
client_exitsession = xstrdup(data);
|
||||
client_exittype = imsg->hdr.type;
|
||||
if (imsg->hdr.type == MSG_DETACHKILL)
|
||||
client_exitreason = CLIENT_EXIT_DETACHED_HUP;
|
||||
else
|
||||
client_exitreason = CLIENT_EXIT_DETACHED;
|
||||
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
||||
break;
|
||||
case MSG_EXIT:
|
||||
if (datalen != 0 && datalen != sizeof (int))
|
||||
fatalx("bad MSG_EXIT size");
|
||||
|
||||
client_exitsession = xstrdup(data);
|
||||
client_exittype = imsg.hdr.type;
|
||||
if (imsg.hdr.type == MSG_DETACHKILL)
|
||||
client_exitreason = CLIENT_EXIT_DETACHED_HUP;
|
||||
else
|
||||
client_exitreason = CLIENT_EXIT_DETACHED;
|
||||
client_write_server(MSG_EXITING, NULL, 0);
|
||||
break;
|
||||
case MSG_EXIT:
|
||||
if (datalen != 0 && datalen != sizeof (int))
|
||||
fatalx("bad MSG_EXIT size");
|
||||
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
||||
client_exitreason = CLIENT_EXIT_EXITED;
|
||||
break;
|
||||
case MSG_EXITED:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_EXITED size");
|
||||
|
||||
client_write_server(MSG_EXITING, NULL, 0);
|
||||
client_exitreason = CLIENT_EXIT_EXITED;
|
||||
break;
|
||||
case MSG_EXITED:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_EXITED size");
|
||||
proc_exit(client_proc);
|
||||
break;
|
||||
case MSG_SHUTDOWN:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_SHUTDOWN size");
|
||||
|
||||
imsg_free(&imsg);
|
||||
return (-1);
|
||||
case MSG_SHUTDOWN:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_SHUTDOWN size");
|
||||
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
||||
client_exitreason = CLIENT_EXIT_SERVER_EXITED;
|
||||
client_exitval = 1;
|
||||
break;
|
||||
case MSG_SUSPEND:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_SUSPEND size");
|
||||
|
||||
client_write_server(MSG_EXITING, NULL, 0);
|
||||
client_exitreason = CLIENT_EXIT_SERVER_EXITED;
|
||||
client_exitval = 1;
|
||||
break;
|
||||
case MSG_SUSPEND:
|
||||
if (datalen != 0)
|
||||
fatalx("bad MSG_SUSPEND size");
|
||||
memset(&sigact, 0, sizeof sigact);
|
||||
sigemptyset(&sigact.sa_mask);
|
||||
sigact.sa_flags = SA_RESTART;
|
||||
sigact.sa_handler = SIG_DFL;
|
||||
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
|
||||
fatal("sigaction failed");
|
||||
kill(getpid(), SIGTSTP);
|
||||
break;
|
||||
case MSG_LOCK:
|
||||
if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_LOCK string");
|
||||
|
||||
memset(&sigact, 0, sizeof sigact);
|
||||
sigemptyset(&sigact.sa_mask);
|
||||
sigact.sa_flags = SA_RESTART;
|
||||
sigact.sa_handler = SIG_DFL;
|
||||
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
|
||||
fatal("sigaction failed");
|
||||
kill(getpid(), SIGTSTP);
|
||||
break;
|
||||
case MSG_LOCK:
|
||||
if (datalen == 0 || data[datalen - 1] != '\0')
|
||||
fatalx("bad MSG_LOCK string");
|
||||
|
||||
system(data);
|
||||
client_write_server(MSG_UNLOCK, NULL, 0);
|
||||
break;
|
||||
}
|
||||
|
||||
imsg_free(&imsg);
|
||||
system(data);
|
||||
proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user