| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1991-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <errno.h> |
| 19 | #include <sys/types.h> |
| 20 | #include <signal.h> |
| 21 | #include <hurd.h> |
| 22 | #include <hurd/port.h> |
| 23 | #include <hurd/signal.h> |
| 24 | #include <hurd/msg.h> |
| 25 | |
| 26 | /* Send a `sig_post' RPC to process number PID. If PID is zero, |
| 27 | send the message to all processes in the current process's process group. |
| 28 | If PID is < -1, send SIG to all processes in process group - PID. |
| 29 | SIG and REFPORT are passed along in the request message. */ |
| 30 | error_t |
| 31 | _hurd_sig_post (pid_t pid, int sig, mach_port_t arg_refport) |
| 32 | { |
| 33 | int delivered = 0; /* Set when we deliver any signal. */ |
| 34 | error_t err; |
| 35 | mach_port_t proc; |
| 36 | struct hurd_userlink ulink; |
| 37 | |
| 38 | inline void kill_pid (pid_t pid) /* Kill one PID. */ |
| 39 | { |
| 40 | err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport), |
| 41 | (refport = arg_refport, 0), 0, |
| 42 | /* If no message port we cannot send signals. */ |
| 43 | msgport == MACH_PORT_NULL ? EPERM : |
| 44 | __msg_sig_post (msgport, sig, 0, refport)); |
| 45 | if (! err) |
| 46 | delivered = 1; |
| 47 | } |
| 48 | |
| 49 | proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink); |
| 50 | |
| 51 | if (pid <= 0) |
| 52 | { |
| 53 | /* Send SIG to each process in pgrp (- PID). */ |
| 54 | mach_msg_type_number_t npids = 10, i; |
| 55 | pid_t pidsbuf[10], *pids = pidsbuf; |
| 56 | |
| 57 | err = __proc_getpgrppids (proc, - pid, &pids, &npids); |
| 58 | if (!err) |
| 59 | { |
| 60 | int self = 0; |
| 61 | for (i = 0; i < npids; ++i) |
| 62 | if (pids[i] == _hurd_pid) |
| 63 | /* We must do ourselves last so we are not suspended |
| 64 | and fail to suspend the other processes in the pgrp. */ |
| 65 | self = 1; |
| 66 | else |
| 67 | { |
| 68 | kill_pid (pids[i]); |
| 69 | if (err == ESRCH) |
| 70 | /* The process died already. Ignore it. */ |
| 71 | err = 0; |
| 72 | } |
| 73 | if (pids != pidsbuf) |
| 74 | __vm_deallocate (__mach_task_self (), |
| 75 | (vm_address_t) pids, npids * sizeof (pids[0])); |
| 76 | |
| 77 | if (self) |
| 78 | kill_pid (_hurd_pid); |
| 79 | } |
| 80 | } |
| 81 | else |
| 82 | kill_pid (pid); |
| 83 | |
| 84 | _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc); |
| 85 | |
| 86 | /* If we delivered no signals, but ERR is clear, this must mean that |
| 87 | every kill_pid call failed with ESRCH, meaning all the processes in |
| 88 | the pgrp died between proc_getpgrppids and kill_pid; in that case we |
| 89 | fail with ESRCH. */ |
| 90 | return delivered ? 0 : err ?: ESRCH; |
| 91 | } |
| 92 | weak_alias (_hurd_sig_post, hurd_sig_post) |