diff options
Diffstat (limited to 'libc/signal')
| -rw-r--r-- | libc/signal/Makefile | 2 | ||||
| -rw-r--r-- | libc/signal/sysv_signal.c | 58 |
2 files changed, 59 insertions, 1 deletions
diff --git a/libc/signal/Makefile b/libc/signal/Makefile index 3f8283857..4200e5e7b 100644 --- a/libc/signal/Makefile +++ b/libc/signal/Makefile @@ -26,7 +26,7 @@ include $(TOPDIR)Rules.mak CSRC=bsd_sig.c raise.c sigblock.c siggetmask.c sigjmp.c signal.c sigintr.c\ sigpause.c sigstmsk.c killpg.c allocrtsig.c sigsetops.c \ sigaddset.c sigandset.c sigdelset.c sigfillset.c sigorset.c \ - sigempty.c sighold.c sigisempty.c sigismem.c sigrelse.c + sigempty.c sighold.c sigisempty.c sigismem.c sigrelse.c sysv_signal.c COBJS=$(patsubst %.c,%.o, $(CSRC)) OBJS=$(COBJS) diff --git a/libc/signal/sysv_signal.c b/libc/signal/sysv_signal.c new file mode 100644 index 000000000..5756ec484 --- /dev/null +++ b/libc/signal/sysv_signal.c @@ -0,0 +1,58 @@ +/* Copyright (C) 1991, 1992, 1996, 1997 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 <signal.h> + +#undef signal + +/* Tolerate non-threads versions of Posix */ +#ifndef SA_ONESHOT +#define SA_ONESHOT 0 +#endif +#ifndef SA_NOMASK +#define SA_NOMASK 0 +#endif +#ifndef SA_INTERRUPT +#define SA_INTERRUPT 0 +#endif + +/* Set the handler for the signal SIG to HANDLER, + returning the old handler, or SIG_ERR on error. */ +__sighandler_t __sysv_signal (int sig, __sighandler_t handler) +{ + struct sigaction act, oact; + + /* Check signal extents to protect __sigismember. */ + if (handler == SIG_ERR || sig < 1 || sig >= NSIG) + { + __set_errno (EINVAL); + return SIG_ERR; + } + + act.sa_handler = handler; + if (__sigemptyset (&act.sa_mask) < 0) + return SIG_ERR; + act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT; + act.sa_flags &= ~SA_RESTART; + if (sigaction (sig, &act, &oact) < 0) + return SIG_ERR; + + return oact.sa_handler; +} + |