1 #include <u.h>
2 #include <signal.h>
3 #include <libc.h>
4 #include "term.h"
5 
6 static void
7 sys(char *buf, int devnull)
8 {
9 	char buf2[100];
10 	char *f[20];
11 	int nf, pid;
12 
13 	notedisable("sys: child");
14 	strcpy(buf2, buf);
15 	nf = tokenize(buf2, f, nelem(f));
16 	f[nf] = nil;
17 	switch(pid = fork()){
18 	case 0:
19 		close(1);
20 		open("/dev/null", OREAD);
21 		close(2);
22 		open("/dev/null", OREAD);
23 		execvp(f[0], f);
24 		_exit(2);
25 	default:
26 		waitpid();
27 	}
28 }
29 
30 int
31 rcstart(int argc, char **argv, int *pfd, int *tfd)
32 {
33 	int fd[2], i, pid;
34 	char *xargv[3];
35 	char slave[256];
36 	int sfd;
37 
38 	if(argc == 0){
39 		argc = 2;
40 		argv = xargv;
41 		argv[0] = getenv("SHELL");
42 		if(argv[0] == 0)
43 			argv[0] = "rc";
44 		argv[1] = "-i";
45 		argv[2] = 0;
46 	}
47 	/*
48 	 * fd0 is slave (tty), fd1 is master (pty)
49 	 */
50 	fd[0] = fd[1] = -1;
51 	if(getpts(fd, slave) < 0){
52 		exit(3);
53 		sysfatal("getpts: %r\n");
54 	}
55 	notedisable("sys: window size change");
56 	pid = fork();
57 	switch(pid){
58 	case 0:
59 		putenv("TERM", "9term");
60 		sfd = childpty(fd, slave);
61 		dup(sfd, 0);
62 		dup(sfd, 1);
63 		dup(sfd, 2);
64 		sys("stty tabs -onlcr icanon echo erase '^h' intr '^?'", 0);
65 		sys("stty onocr", 1);	/* not available on mac */
66 		if(noecho)
67 			sys("stty -echo", 0);
68 		for(i=3; i<100; i++)
69 			close(i);
70 		signal(SIGINT, SIG_DFL);
71 		signal(SIGHUP, SIG_DFL);
72 		signal(SIGTERM, SIG_DFL);
73 		execvp(argv[0], argv);
74 		fprint(2, "exec %s failed: %r\n", argv[0]);
75 		_exit(2);
76 		break;
77 	case -1:
78 		sysfatal("proc failed: %r");
79 		break;
80 	}
81 	*pfd = fd[1];
82 	close(fd[0]);
83 	if(tfd){
84 		if((*tfd = open(slave, OREAD)) < 0)
85 			sysfatal("parent open %s: %r", slave);
86 	}
87 	return pid;
88 }
89