listen1.c - 9base - revived minimalist port of Plan 9 userland to Unix
HTML git clone git://git.suckless.org/9base
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
listen1.c (1652B)
---
1 #include <u.h>
2 #include <libc.h>
3 #include <auth.h>
4
5 int verbose;
6 int trusted;
7
8 void
9 usage(void)
10 {
11 fprint(2, "usage: listen1 [-v] address cmd args...\n");
12 exits("usage");
13 }
14
15 char*
16 remoteaddr(char *dir)
17 {
18 static char buf[128];
19 char *p;
20 int n, fd;
21
22 snprint(buf, sizeof buf, "%s/remote", dir);
23 fd = open(buf, OREAD);
24 if(fd < 0)
25 return "";
26 n = read(fd, buf, sizeof(buf));
27 close(fd);
28 if(n > 0){
29 buf[n] = 0;
30 p = strchr(buf, '!');
31 if(p)
32 *p = 0;
33 return buf;
34 }
35 return "";
36 }
37
38 void
39 main(int argc, char **argv)
40 {
41 char dir[40], ndir[40];
42 int ctl, nctl, fd;
43
44 ARGBEGIN{
45 default:
46 usage();
47 case 't':
48 trusted = 1;
49 break;
50 case 'v':
51 verbose = 1;
52 break;
53 }ARGEND
54
55 if(argc < 2)
56 usage();
57
58 if(!verbose){
59 close(1);
60 fd = open("/dev/null", OWRITE);
61 if(fd != 1){
62 dup(fd, 1);
63 close(fd);
64 }
65 }
66
67 print("listen started\n");
68 ctl = announce(argv[0], dir);
69 if(ctl < 0)
70 sysfatal("announce %s: %r", argv[0]);
71
72 for(;;){
73 nctl = listen(dir, ndir);
74 if(nctl < 0)
75 sysfatal("listen %s: %r", argv[0]);
76
77 switch(rfork(RFFDG|RFPROC|RFNOWAIT|RFNOTEG)){
78 case -1:
79 close(nctl);
80 continue;
81 case 0:
82 fd = accept(nctl, ndir);
83 if(fd < 0){
84 fprint(2, "accept %s: can't open %s/data: %r", argv[0], ndir);
85 _exits(0);
86 }
87 print("incoming call for %s from %s in %s\n", argv[0], remoteaddr(ndir), ndir);
88 close(ctl);
89 close(nctl);
90 /*putenv("net", ndir); */
91 /*sprint(data, "%s/data", ndir); */
92 /*bind(data, "/dev/cons", MREPL); */
93 dup(fd, 0);
94 dup(fd, 1);
95 dup(fd, 2);
96 close(fd);
97 exec(argv[1], argv+1);
98 fprint(2, "exec: %r");
99 exits(nil);
100 default:
101 close(nctl);
102 break;
103 }
104 }
105 }