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bfff8b1b | 1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
478b92f0 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
478b92f0 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
478b92f0 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
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 signal SIG to process number PID. If PID is zero, | |
27 | send SIG 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 | int | |
30 | __kill (pid_t pid, int sig) | |
31 | { | |
32 | int delivered = 0; /* Set when we deliver any signal. */ | |
33 | error_t err; | |
34 | mach_port_t proc; | |
35 | struct hurd_userlink ulink; | |
36 | ||
b8826932 | 37 | void kill_pid (pid_t pid) /* Kill one PID. */ |
28f540f4 RM |
38 | { |
39 | /* SIGKILL is not delivered as a normal signal. | |
40 | Sending SIGKILL to a process means to terminate its task. */ | |
41 | if (sig == SIGKILL) | |
42 | /* Fetch the process's task port and terminate the task. We | |
43 | loop in case the process execs and changes its task port. | |
44 | If the old task port dies after we fetch it but before we | |
45 | send the RPC, we get MACH_SEND_INVALID_DEST; if it dies | |
46 | after we send the RPC request but before it is serviced, we | |
47 | get MIG_SERVER_DIED. */ | |
48 | do | |
49 | { | |
50 | task_t refport; | |
51 | err = __proc_pid2task (proc, pid, &refport); | |
8c1442d0 RM |
52 | /* Ignore zombies. */ |
53 | if (!err && refport != MACH_PORT_NULL) | |
28f540f4 RM |
54 | { |
55 | err = __task_terminate (refport); | |
56 | __mach_port_deallocate (__mach_task_self (), refport); | |
57 | } | |
58 | } while (err == MACH_SEND_INVALID_DEST || | |
59 | err == MIG_SERVER_DIED); | |
60 | else | |
3c46a92d RM |
61 | { |
62 | error_t taskerr; | |
63 | error_t kill_port (mach_port_t msgport, mach_port_t refport) | |
64 | { | |
65 | if (msgport != MACH_PORT_NULL) | |
66 | /* Send a signal message to his message port. */ | |
8f0c527e | 67 | return __msg_sig_post (msgport, sig, 0, refport); |
3c46a92d RM |
68 | |
69 | /* The process has no message port. Perhaps try direct | |
70 | frobnication of the task. */ | |
71 | ||
72 | if (taskerr) | |
73 | /* If we could not get the task port, we can do nothing. */ | |
74 | return taskerr; | |
75 | ||
8c1442d0 RM |
76 | if (refport == MACH_PORT_NULL) |
77 | /* proc_pid2task returned success with a null task port. | |
78 | That means the process is a zombie. Signals | |
79 | to zombies should return success and do nothing. */ | |
80 | return 0; | |
81 | ||
3c46a92d RM |
82 | /* For user convenience in the case of a task that has |
83 | not registered any message port with the proc server, | |
84 | translate a few signals to direct task operations. */ | |
85 | switch (sig) | |
86 | { | |
87 | /* The only signals that really make sense for an | |
88 | unregistered task are kill, suspend, and continue. */ | |
89 | case SIGSTOP: | |
90 | case SIGTSTP: | |
91 | return __task_suspend (refport); | |
92 | case SIGCONT: | |
93 | return __task_resume (refport); | |
8c1442d0 | 94 | case SIGTERM: |
3c46a92d RM |
95 | case SIGQUIT: |
96 | case SIGINT: | |
97 | return __task_terminate (refport); | |
98 | default: | |
99 | /* We have full permission to send signals, but there is | |
100 | no meaningful way to express this signal. */ | |
101 | return EPERM; | |
102 | } | |
103 | } | |
104 | err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport), | |
105 | (taskerr = __proc_pid2task (proc, pid, | |
106 | &refport)) ? | |
107 | __proc_getsidport (proc, &refport) : 0, 1, | |
108 | kill_port (msgport, refport)); | |
109 | } | |
28f540f4 RM |
110 | if (! err) |
111 | delivered = 1; | |
112 | } | |
113 | ||
114 | proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink); | |
115 | ||
116 | if (pid <= 0) | |
117 | { | |
118 | /* Send SIG to each process in pgrp (- PID). */ | |
119 | pid_t pidbuf[10], *pids = pidbuf; | |
120 | mach_msg_type_number_t i, npids = sizeof (pidbuf) / sizeof (pidbuf[0]); | |
8c1442d0 | 121 | |
28f540f4 RM |
122 | err = __proc_getpgrppids (proc, - pid, &pids, &npids); |
123 | if (!err) | |
124 | { | |
125 | for (i = 0; i < npids; ++i) | |
126 | { | |
127 | kill_pid (pids[i]); | |
128 | if (err == ESRCH) | |
129 | /* The process died already. Ignore it. */ | |
130 | err = 0; | |
131 | } | |
132 | if (pids != pidbuf) | |
133 | __vm_deallocate (__mach_task_self (), | |
134 | (vm_address_t) pids, npids * sizeof (pids[0])); | |
135 | } | |
136 | } | |
137 | else | |
138 | kill_pid (pid); | |
139 | ||
140 | _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc); | |
141 | ||
142 | /* If we delivered no signals, but ERR is clear, this must mean that | |
143 | every kill_pid call failed with ESRCH, meaning all the processes in | |
144 | the pgrp died between proc_getpgrppids and kill_pid; in that case we | |
145 | fail with ESRCH. */ | |
146 | return delivered ? 0 : __hurd_fail (err ?: ESRCH); | |
147 | } | |
148 | ||
149 | weak_alias (__kill, kill) |