blob: eb83c9011d3c6148ba6dd6abb3c33fd623697425 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#include "rc.h"
#include "parse.h"
#include "exec.h"
#include <signal.h>
#include <termios.h>
// -----------------------------------------------------------------------
// globals
Thread *runner = nil;
Shell shell = { 0 };
// -----------------------------------------------------------------------
// functions
void
initshell(void)
{
if((shell.interactive=isatty(0))){
while(tcgetpgrp(0) != (shell.pid = getpgrp()))
kill(-shell.pid, SIGTTIN);
/* ignore job control signals */
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTSTP, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
/*
* NOTE: if SIGCHLD is set to SIG_IGN then
* 1. children that terminate do not become zombies
* 2. call a to wait() will block until all children have terminated
* 3. the call to wait will fail with errno == ECHILD
* see for discussion:
* https://stackoverflow.com/questions/1608017/no-child-process-error-from-waitpid-when-waiting-for-process-group
*/
// signal(SIGCHLD, SIG_IGN);
/* take control */
shell.pid = getpid();
if(setpgid(shell.pid, shell.pid)<0)
fatal("could not put shell in its own process group");
tcsetpgrp(shell.pid, shell.pid);
}
}
// -----------------------------------------------------------------------
// main point of entry
int
main(int argc, char *argv[])
{
shell.err = openfd(2);
/* yydebug=1; */
initenv();
initpath();
initkeywords();
initshell();
inithistory();
/* enablevi(); */
xboot(argc, argv);
/* unreachable */
}
|