diff options
Diffstat (limited to 'signal')
| -rw-r--r-- | signal/Makefile | 7 | ||||
| -rw-r--r-- | signal/allocrtsig.c | 89 | ||||
| -rw-r--r-- | signal/signal.h | 44 |
3 files changed, 137 insertions, 3 deletions
diff --git a/signal/Makefile b/signal/Makefile index e35fb12345..29aeea5f2b 100644 --- a/signal/Makefile +++ b/signal/Makefile @@ -22,7 +22,7 @@ subdir := signal headers := signal.h sys/signal.h bits/signum.h bits/sigcontext.h \ - bits/sigaction.h bits/sigset.h + bits/sigaction.h bits/sigset.h bits/siginfo.h routines := signal raise killpg \ sigaction sigprocmask kill \ @@ -32,11 +32,12 @@ routines := signal raise killpg \ sigsetops sigempty sigfillset sigaddset sigdelset sigismem \ sigreturn \ siggetmask sysv_signal \ - sigisempty sigandset sigorset + sigisempty sigandset sigorset \ + allocrtsig sigtimedwait sigwaitinfo sigqueue tests := tst-signal -distribute := sigsetops.h +distribute := sigsetops.h testrtsig.h include ../Rules diff --git a/signal/allocrtsig.c b/signal/allocrtsig.c new file mode 100644 index 0000000000..678bc8b17b --- /dev/null +++ b/signal/allocrtsig.c @@ -0,0 +1,89 @@ +/* Handle real-time signal allocation. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <signal.h> + +/* In these variables we keep track of the used variables. If the + platform does not support any real-time signals we will define the + values to some unreasonable value which will signal failing of all + the functions below. */ +#ifndef __SIGRTMIN +static int current_rtmin = -1; +static int current_rtmax = -1; +#else +static int current_rtmin = __SIGRTMIN; +static int current_rtmax = __SIGRTMAX; + +static int initialized; + +#include "testrtsig.h" + +static void +init (void) +{ + if (!kernel_has_rtsig ()) + { + current_rtmin = -1; + current_rtmax = -1; + } + initialized = 1; +} +#endif + +/* Return number of available real-time signal with highest priority. */ +int +__libc_current_sigrtmin (void) +{ +#ifdef __SIGRTMIN + if (!initialized) + init (); +#endif + return current_rtmin; +} + +/* Return number of available real-time signal with lowest priority. */ +int +__libc_current_sigrtmax (void) +{ +#ifdef __SIGRTMIN + if (!initialized) + init (); +#endif + return current_rtmax; +} + +/* Allocate real-time signal with highest/lowest available + priority. Please note that we don't use a lock since we assume + this function to be called at program start. */ +int +__libc_allocate_rtsig (int high) +{ +#ifndef __SIGRTMIN + return -1; +#else + if (!initialized) + init (); + if (current_rtmin != -1 || current_rtmin > current_rtmax) + /* We don't have anymore signal available. */ + return -1; + + return high ? current_rtmin++ : current_rtmax--; +#endif +} diff --git a/signal/signal.h b/signal/signal.h index 5fb4bc2a14..8691b6880e 100644 --- a/signal/signal.h +++ b/signal/signal.h @@ -172,6 +172,20 @@ typedef __sigset_t sigset_t; # ifdef _SIGNAL_H +/* We need `struct timespec' later on. */ +# define __need_timespec +# include <time.h> + +/* Type for data associated with a signal. */ +typedef union sigval + { + int sival_int; + void *sival_ptr; + } sigval_t; + +/* Get the `siginfo_t' type plus the needed symbols. */ +# include <bits/siginfo.h> + /* Clear all signals from SET. */ extern int sigemptyset __P ((sigset_t *__set)); @@ -229,6 +243,24 @@ extern int sigpending __P ((sigset_t *__set)); extern int __sigwait __P ((__const sigset_t *__set, int *__sig)); extern int sigwait __P ((__const sigset_t *__set, int *__sig)); +/* Select any of pending signals from SET and place information in INFO. */ +extern int __sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info)); +extern int sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info)); + +/* Select any of pending signals from SET and place information in INFO. + Wait the imte specified by TIMEOUT if no signal is pending. */ +extern int __sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info, + __const struct timespec *__timeout)); +extern int sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info, + __const struct timespec *__timeout)); + +/* Send signal SIG to the process PID. Associate data in VAL with the + signal. */ +extern int __sigqueue __P ((__pid_t __pid, int __sig, + __const union sigval __val)); +extern int sigqueue __P ((__pid_t __pid, int __sig, + __const union sigval __val)); + # endif /* <signal.h> included. */ #endif /* Use POSIX. */ @@ -313,6 +345,18 @@ extern int sigaltstack __P ((__const struct sigaltstack *__ss, #endif /* signal.h included and use BSD or X/Open Unix. */ + +/* The following functions are used internally in the C library and in + other code which need deep insights. */ + +/* Return number of available real-time signal with highest priority. */ +extern int __libc_current_sigrtmin __P ((void)); +/* Return number of available real-time signal with lowest priority. */ +extern int __libc_current_sigrtmax __P ((void)); + +/* Allocate real-time signal with highest/lowest available priority. */ +extern int __libc_allocate_rtsig __P ((int __high)); + __END_DECLS #endif /* signal.h */ |