Back to index

glibc  2.9
sigaction.h
Go to the documentation of this file.
00001 /* The proper definitions for Linux/MIPS's sigaction.
00002    Copyright (C) 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2003
00003        Free Software Foundation, Inc.
00004    This file is part of the GNU C Library.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #ifndef _SIGNAL_H
00022 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
00023 #endif
00024 
00025 /* Structure describing the action to be taken when a signal arrives.  */
00026 struct sigaction
00027   {
00028     /* Special flags.  */
00029     unsigned int sa_flags;
00030 
00031     /* Signal handler.  */
00032 #ifdef __USE_POSIX199309
00033     union
00034       {
00035        /* Used if SA_SIGINFO is not set.  */
00036        __sighandler_t sa_handler;
00037        /* Used if SA_SIGINFO is set.  */
00038        void (*sa_sigaction) (int, siginfo_t *, void *);
00039       }
00040     __sigaction_handler;
00041 # define sa_handler    __sigaction_handler.sa_handler
00042 # define sa_sigaction  __sigaction_handler.sa_sigaction
00043 #else
00044     __sighandler_t sa_handler;
00045 #endif
00046     /* Additional set of signals to be blocked.  */
00047     __sigset_t sa_mask;
00048 
00049     /* The ABI says here are two unused ints following. */
00050     /* Restore handler.  */
00051     void (*sa_restorer) (void);
00052 
00053 #if _MIPS_SZPTR < 64
00054     int sa_resv[1];
00055 #endif
00056   };
00057 
00058 /* Bits in `sa_flags'.  */
00059 /* Please note that some Linux kernels versions use different values for these
00060    flags which is a bug in those kernel versions.  */
00061 #define SA_NOCLDSTOP  0x00000001 /* Don't send SIGCHLD when children stop.  */
00062 #define SA_NOCLDWAIT  0x00010000 /* Don't create zombie on child death.  */
00063 #define SA_SIGINFO    0x00000008 /* Invoke signal-catching function with
00064                                 three arguments instead of one.  */
00065 #if defined __USE_UNIX98 || defined __USE_MISC
00066 # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
00067 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
00068 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
00069 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
00070                                 its handler is being executed.  */
00071 #endif
00072 #ifdef __USE_MISC
00073 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
00074 
00075 /* Some aliases for the SA_ constants.  */
00076 # define SA_NOMASK    SA_NODEFER
00077 # define SA_ONESHOT   SA_RESETHAND
00078 # define SA_STACK     SA_ONSTACK
00079 #endif
00080 
00081 /* Values for the HOW argument to `sigprocmask'.  */
00082 #define SIG_NOP            0              /* 0 is unused to catch errors */
00083 #define       SIG_BLOCK     1             /* Block signals.  */
00084 #define       SIG_UNBLOCK   2             /* Unblock signals.  */
00085 #define       SIG_SETMASK   3             /* Set the set of blocked signals.  */
00086 #ifdef __USE_MISC
00087 # define SIG_SETMASK32 256  /* Goodie from SGI for BSD compatibility:
00088                                set only the low 32 bit of the sigset.  */
00089 #endif