1 #include <u.h>
2 #include <signal.h>
3 #include <libc.h>
4 #include "term.h"
5 
6 int loginshell;
7 
8 static void
9 sys(char *buf, int devnull)
10 {
11 	char buf2[100];
12 	char *f[20];
13 	int nf, pid;
14 
15 	notedisable("sys: child");
16 	strcpy(buf2, buf);
17 	nf = tokenize(buf2, f, nelem(f));
18 	f[nf] = nil;
19 	switch(pid = fork()){
20 	case 0:
21 		close(1);
22 		open("/dev/null", OREAD);
23 		close(2);
24 		open("/dev/null", OREAD);
25 		execvp(f[0], f);
26 		_exit(2);
27 	default:
28 		waitpid();
29 	}
30 }
31 
32 int
33 rcstart(int argc, char **argv, int *pfd, int *tfd)
34 {
35 	int fd[2], i, pid;
36 	char *cmd, *xargv[3];
37 	char slave[256];
38 	int sfd;
39 
40 	if(argc == 0){
41 		argc = 2;
42 		argv = xargv;
43 		argv[0] = getenv("SHELL");
44 		if(argv[0] == 0)
45 			argv[0] = "rc";
46 		argv[1] = "-i";
47 		argv[2] = 0;
48 	}
49 	cmd = argv[0];
50 	if(loginshell){
51 		argv[0] = malloc(strlen(cmd)+2);
52 		strcpy(argv[0]+1, cmd);
53 		argv[0][0] = '-';
54 	}
55 
56 	/*
57 	 * fd0 is slave (tty), fd1 is master (pty)
58 	 */
59 	fd[0] = fd[1] = -1;
60 	if(getpts(fd, slave) < 0){
61 		exit(3);
62 		sysfatal("getpts: %r\n");
63 	}
64 	/*
65 	 * notedisable("sys: window size change");
66 	 * 
67 	 * Can't disable because will be inherited by other programs
68 	 * like if you run an xterm from the prompt, and then xterm's
69 	 * resizes won't get handled right.  Sigh.  
70 	 *
71 	 * Can't not disable because when we stty below we'll get a
72 	 * signal, which will drop us into the thread library note handler,
73 	 * which will get all confused because we just forked and thus
74 	 * have an unknown pid. 
75 	 *
76 	 * So disable it internally.  ARGH!
77 	 */
78 	notifyoff("sys: window size change");
79 
80 	pid = fork();
81 	switch(pid){
82 	case 0:
83 		putenv("TERM", "9term");
84 		sfd = childpty(fd, slave);
85 		dup(sfd, 0);
86 		dup(sfd, 1);
87 		dup(sfd, 2);
88 		sys("stty tabs -onlcr icanon echo erase '^h' intr '^?'", 0);
89 		sys("stty onocr", 1);	/* not available on mac */
90 		if(noecho)
91 			sys("stty -echo", 0);
92 		for(i=3; i<100; i++)
93 			close(i);
94 		signal(SIGINT, SIG_DFL);
95 		signal(SIGHUP, SIG_DFL);
96 		signal(SIGTERM, SIG_DFL);
97 		execvp(cmd, argv);
98 		fprint(2, "exec %s failed: %r\n", argv[0]);
99 		_exit(2);
100 		break;
101 	case -1:
102 		sysfatal("proc failed: %r");
103 		break;
104 	}
105 	*pfd = fd[1];
106 	close(fd[0]);
107 	if(tfd){
108 		if((*tfd = open(slave, OREAD)) < 0)
109 			sysfatal("parent open %s: %r", slave);
110 	}
111 	return pid;
112 }
113