diff options
Diffstat (limited to 'libc/sysdeps/mach/hurd/kill.c')
| -rw-r--r-- | libc/sysdeps/mach/hurd/kill.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/libc/sysdeps/mach/hurd/kill.c b/libc/sysdeps/mach/hurd/kill.c new file mode 100644 index 000000000..a9946e0af --- /dev/null +++ b/libc/sysdeps/mach/hurd/kill.c @@ -0,0 +1,150 @@ +/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <sys/types.h> +#include <signal.h> +#include <hurd.h> +#include <hurd/port.h> +#include <hurd/signal.h> +#include <hurd/msg.h> + +/* Send signal SIG to process number PID. If PID is zero, + send SIG to all processes in the current process's process group. + If PID is < -1, send SIG to all processes in process group - PID. */ +int +__kill (pid_t pid, int sig) +{ + int delivered = 0; /* Set when we deliver any signal. */ + error_t err; + mach_port_t proc; + struct hurd_userlink ulink; + + void kill_pid (pid_t pid) /* Kill one PID. */ + { + /* SIGKILL is not delivered as a normal signal. + Sending SIGKILL to a process means to terminate its task. */ + if (sig == SIGKILL) + /* Fetch the process's task port and terminate the task. We + loop in case the process execs and changes its task port. + If the old task port dies after we fetch it but before we + send the RPC, we get MACH_SEND_INVALID_DEST; if it dies + after we send the RPC request but before it is serviced, we + get MIG_SERVER_DIED. */ + do + { + task_t refport; + err = __proc_pid2task (proc, pid, &refport); + /* Ignore zombies. */ + if (!err && refport != MACH_PORT_NULL) + { + err = __task_terminate (refport); + __mach_port_deallocate (__mach_task_self (), refport); + } + } while (err == MACH_SEND_INVALID_DEST || + err == MIG_SERVER_DIED); + else + { + error_t taskerr; + error_t kill_port (mach_port_t msgport, mach_port_t refport) + { + if (msgport != MACH_PORT_NULL) + /* Send a signal message to his message port. */ + return __msg_sig_post (msgport, sig, 0, refport); + + /* The process has no message port. Perhaps try direct + frobnication of the task. */ + + if (taskerr) + /* If we could not get the task port, we can do nothing. */ + return taskerr; + + if (refport == MACH_PORT_NULL) + /* proc_pid2task returned success with a null task port. + That means the process is a zombie. Signals + to zombies should return success and do nothing. */ + return 0; + + /* For user convenience in the case of a task that has + not registered any message port with the proc server, + translate a few signals to direct task operations. */ + switch (sig) + { + /* The only signals that really make sense for an + unregistered task are kill, suspend, and continue. */ + case SIGSTOP: + case SIGTSTP: + return __task_suspend (refport); + case SIGCONT: + return __task_resume (refport); + case SIGTERM: + case SIGQUIT: + case SIGINT: + return __task_terminate (refport); + default: + /* We have full permission to send signals, but there is + no meaningful way to express this signal. */ + return EPERM; + } + } + err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport), + (taskerr = __proc_pid2task (proc, pid, + &refport)) ? + __proc_getsidport (proc, &refport) : 0, 1, + kill_port (msgport, refport)); + } + if (! err) + delivered = 1; + } + + proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink); + + if (pid <= 0) + { + /* Send SIG to each process in pgrp (- PID). */ + pid_t pidbuf[10], *pids = pidbuf; + mach_msg_type_number_t i, npids = sizeof (pidbuf) / sizeof (pidbuf[0]); + + err = __proc_getpgrppids (proc, - pid, &pids, &npids); + if (!err) + { + for (i = 0; i < npids; ++i) + { + kill_pid (pids[i]); + if (err == ESRCH) + /* The process died already. Ignore it. */ + err = 0; + } + if (pids != pidbuf) + __vm_deallocate (__mach_task_self (), + (vm_address_t) pids, npids * sizeof (pids[0])); + } + } + else + kill_pid (pid); + + _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc); + + /* If we delivered no signals, but ERR is clear, this must mean that + every kill_pid call failed with ESRCH, meaning all the processes in + the pgrp died between proc_getpgrppids and kill_pid; in that case we + fail with ESRCH. */ + return delivered ? 0 : __hurd_fail (err ?: ESRCH); +} + +weak_alias (__kill, kill) |