ccf7f0e4d
Denys Vlasenko
2016-01-17
Subject
setsid: implement -c
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miscutils/setsid.c+13 -6
| @@ -15,19 +15,22 @@ | |
| */ | |
| //usage:#define setsid_trivial_usage | |
| - | //usage: "PROG ARGS" |
| + | //usage: "[-c] PROG ARGS" |
| //usage:#define setsid_full_usage "\n\n" | |
| //usage: "Run PROG in a new session. PROG will have no controlling terminal\n" | |
| - | //usage: "and will not be affected by keyboard signals (Ctrl-C etc).\n" |
| - | //usage: "See setsid(2) for details." |
| + | //usage: "and will not be affected by keyboard signals (^C etc).\n" |
| + | //usage: "\n -c Set controlling terminal to stdin" |
| #include "libbb.h" | |
| int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | |
| int setsid_main(int argc UNUSED_PARAM, char **argv) | |
| { | |
| - | if (!argv[1]) |
| - | bb_show_usage(); |
| + | unsigned opt; |
| + | |
| + | opt_complementary = "-1"; /* at least one arg */ |
| + | opt = getopt32(argv, "c"); |
| + | argv += optind; |
| /* setsid() is allowed only when we are not a process group leader. | |
| * Otherwise our PID serves as PGID of some existing process group | |
| @@ -61,6 +64,10 @@ int setsid_main(int argc UNUSED_PARAM, char **argv) | |
| setsid(); | |
| } | |
| - | argv++; |
| + | if (opt) { |
| + | /* -c: set (with stealing) controlling tty */ |
| + | ioctl(0, TIOCSCTTY, 1); |
| + | } |
| + | |
| BB_EXECVP_or_die(argv); | |
| } | |