Add a flag to run a background process in a pty as well, not used for

anything yet.

cmd-if-shell.c

@@ -144,7 +144,8 @@ cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
 	cmd_find_copy_state(&cdata->input.fs, fs);
 
 	if (job_run(shellcmd, s, server_client_get_cwd(item->client, s), NULL,
-	    cmd_if_shell_callback, cmd_if_shell_free, cdata, 0) == NULL) {
+	    cmd_if_shell_callback, cmd_if_shell_free, cdata, 0, -1,
+	    -1) == NULL) {
 		cmdq_error(item, "failed to run command: %s", shellcmd);
 		free(shellcmd);
 		free(cdata);

cmd-run-shell.c

@@ -145,8 +145,8 @@ cmd_run_shell_timer(__unused int fd, __unused short events, void* arg)
 
 	if (cdata->cmd != NULL) {
 		if (job_run(cdata->cmd, cdata->s, cdata->cwd, NULL,
-		    cmd_run_shell_callback, cmd_run_shell_free, cdata,
+		    cmd_run_shell_callback, cmd_run_shell_free, cdata, 0, -1,
-		    0) == NULL)
+		    -1) == NULL)
 			cmd_run_shell_free(cdata);
 	} else {
 		if (cdata->item != NULL)

format.c

@@ -354,7 +354,7 @@ format_job_get(struct format_tree *ft, const char *cmd)
 	if (force || (fj->job == NULL && fj->last != t)) {
 		fj->job = job_run(expanded, NULL,
 		    server_client_get_cwd(ft->client, NULL), format_job_update,
-		    format_job_complete, NULL, fj, JOB_NOWAIT);
+		    format_job_complete, NULL, fj, JOB_NOWAIT, -1, -1);
 		if (fj->job == NULL) {
 			free(fj->out);
 			xasprintf(&fj->out, "<'%s' didn't start>", fj->cmd);

job.c

@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <util.h>
 
 #include "tmux.h"
 
@@ -69,18 +70,15 @@ static LIST_HEAD(joblist, job) all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
 struct job *
 job_run(const char *cmd, struct session *s, const char *cwd,
     job_update_cb updatecb, job_complete_cb completecb, job_free_cb freecb,
-    void *data, int flags)
+    void *data, int flags, int sx, int sy)
 {
 	struct job	*job;
 	struct environ	*env;
 	pid_t		 pid;
-	int		 nullfd, out[2];
+	int		 nullfd, out[2], master;
 	const char	*home;
 	sigset_t	 set, oldset;
-
+	struct winsize	 ws;
-	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
-		return (NULL);
-	log_debug("%s: cmd=%s, cwd=%s", __func__, cmd, cwd == NULL ? "" : cwd);
 
 	/*
 	 * Do not set TERM during .tmux.conf, it is nice to be able to use
@@ -90,13 +88,26 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 
 	sigfillset(&set);
 	sigprocmask(SIG_BLOCK, &set, &oldset);
-	switch (pid = fork()) {
+
+	if (flags & JOB_PTY) {
+		memset(&ws, 0, sizeof ws);
+		ws.ws_col = sx;
+		ws.ws_row = sy;
+		pid = fdforkpty(ptm_fd, &master, NULL, NULL, &ws);
+	} else {
+		if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
+			goto fail;
+		pid = fork();
+	}
+	log_debug("%s: cmd=%s, cwd=%s", __func__, cmd, cwd == NULL ? "" : cwd);
+
+	switch (pid) {
 	case -1:
-		sigprocmask(SIG_SETMASK, &oldset, NULL);
+		if (~flags & JOB_PTY) {
-		environ_free(env);
 			close(out[0]);
 			close(out[1]);
-		return (NULL);
+		}
+		goto fail;
 	case 0:
 		proc_clear_signals(server_proc, 1);
 		sigprocmask(SIG_SETMASK, &oldset, NULL);
@@ -109,6 +120,7 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 		environ_push(env);
 		environ_free(env);
 
+		if (~flags & JOB_PTY) {
 			if (dup2(out[1], STDIN_FILENO) == -1)
 				fatal("dup2 failed");
 			if (dup2(out[1], STDOUT_FILENO) == -1)
@@ -124,7 +136,7 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 				fatal("dup2 failed");
 			if (nullfd != STDERR_FILENO)
 				close(nullfd);
-
+		}
 		closefrom(STDERR_FILENO + 1);
 
 		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
@@ -133,7 +145,6 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 
 	sigprocmask(SIG_SETMASK, &oldset, NULL);
 	environ_free(env);
-	close(out[1]);
 
 	job = xmalloc(sizeof *job);
 	job->state = JOB_RUNNING;
@@ -150,7 +161,11 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 	job->freecb = freecb;
 	job->data = data;
 
+	if (~flags & JOB_PTY) {
+		close(out[1]);
 		job->fd = out[0];
+	} else
+		job->fd = master;
 	setblocking(job->fd, 0);
 
 	job->event = bufferevent_new(job->fd, job_read_callback,
@@ -161,6 +176,11 @@ job_run(const char *cmd, struct session *s, const char *cwd,
 
 	log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
 	return (job);
+
+fail:
+	sigprocmask(SIG_SETMASK, &oldset, NULL);
+	environ_free(env);
+	return (NULL);
 }
 
 /* Kill and free an individual job. */
@@ -209,7 +229,7 @@ job_write_callback(__unused struct bufferevent *bufev, void *data)
 	log_debug("job write %p: %s, pid %ld, output left %zu", job, job->cmd,
 	    (long) job->pid, len);
 
-	if (len == 0) {
+	if (len == 0 && (~job->flags & JOB_KEEPWRITE)) {
 		shutdown(job->fd, SHUT_WR);
 		bufferevent_disable(job->event, EV_WRITE);
 	}

tmux.h

@@ -1929,8 +1929,11 @@ typedef void (*job_update_cb) (struct job *);
 typedef void (*job_complete_cb) (struct job *);
 typedef void (*job_free_cb) (void *);
 #define JOB_NOWAIT 0x1
+#define JOB_KEEPWRITE 0x2
+#define JOB_PTY 0x4
 struct job	*job_run(const char *, struct session *, const char *,
-		     job_update_cb, job_complete_cb, job_free_cb, void *, int);
+		     job_update_cb, job_complete_cb, job_free_cb, void *, int,
+		     int, int);
 void		 job_free(struct job *);
 void		 job_check_died(pid_t, int);
 int		 job_get_status(struct job *);

window-copy.c

@@ -3240,7 +3240,7 @@ window_copy_copy_buffer(struct window_mode_entry *wme, const char *prefix,
 
 static void
 window_copy_copy_pipe(struct window_mode_entry *wme, struct session *s,
-    const char *prefix, const char *command)
+    const char *prefix, const char *cmd)
 {
 	void		*buf;
 	size_t		 len;
@@ -3250,7 +3250,7 @@ window_copy_copy_pipe(struct window_mode_entry *wme, struct session *s,
 	if (buf == NULL)
 		return;
 
-	job = job_run(command, s, NULL, NULL, NULL, NULL, NULL, JOB_NOWAIT);
+	job = job_run(cmd, s, NULL, NULL, NULL, NULL, NULL, JOB_NOWAIT, -1, -1);
 	bufferevent_write(job_get_event(job), buf, len);
 	window_copy_copy_buffer(wme, prefix, buf, len);
 }