* @brief Sends a signal to a process or a group of processes. * * This system call sends the signal specified by `signo` to the process or process group * identified by `pid`. If `pid` is positive, the signal is sent to the process with the * specified process ID. If `pid` is `0`, the signal is sent to all processes in the * same process group as the caller. If `pid` is `-1`, the signal is se
| 1373 | * @see signal(), killpg(), raise() |
| 1374 | */ |
| 1375 | sysret_t sys_kill(int pid, int signo) |
| 1376 | { |
| 1377 | rt_err_t kret = 0; |
| 1378 | sysret_t sysret; |
| 1379 | struct rt_lwp *lwp = RT_NULL; |
| 1380 | |
| 1381 | /* handling the semantics of sys_kill */ |
| 1382 | if (pid > 0) |
| 1383 | { |
| 1384 | /** |
| 1385 | * Brief: Match the pid and send signal to the lwp if found |
| 1386 | * Note: Critical Section |
| 1387 | * - pid tree (READ. since the lwp is fetch from the pid tree, it must stay there) |
| 1388 | */ |
| 1389 | lwp_pid_lock_take(); |
| 1390 | lwp = lwp_from_pid_raw_locked(pid); |
| 1391 | if (lwp) |
| 1392 | { |
| 1393 | lwp_ref_inc(lwp); |
| 1394 | lwp_pid_lock_release(); |
| 1395 | } |
| 1396 | else |
| 1397 | { |
| 1398 | lwp_pid_lock_release(); |
| 1399 | kret = -RT_ENOENT; |
| 1400 | } |
| 1401 | |
| 1402 | if (lwp) |
| 1403 | { |
| 1404 | kret = lwp_signal_kill(lwp, signo, SI_USER, 0); |
| 1405 | lwp_ref_dec(lwp); |
| 1406 | } |
| 1407 | } |
| 1408 | else if (pid < -1 || pid == 0) |
| 1409 | { |
| 1410 | pid_t pgid = 0; |
| 1411 | rt_processgroup_t group; |
| 1412 | |
| 1413 | if (pid == 0) |
| 1414 | { |
| 1415 | /** |
| 1416 | * sig shall be sent to all processes (excluding an unspecified set |
| 1417 | * of system processes) whose process group ID is equal to the process |
| 1418 | * group ID of the sender, and for which the process has permission to |
| 1419 | * send a signal. |
| 1420 | */ |
| 1421 | pgid = lwp_pgid_get_byprocess(lwp_self()); |
| 1422 | } |
| 1423 | else |
| 1424 | { |
| 1425 | /** |
| 1426 | * sig shall be sent to all processes (excluding an unspecified set |
| 1427 | * of system processes) whose process group ID is equal to the absolute |
| 1428 | * value of pid, and for which the process has permission to send a signal. |
| 1429 | */ |
| 1430 | pgid = -pid; |
| 1431 | } |
| 1432 |
nothing calls this directly
no test coverage detected