diff options
Diffstat (limited to 'signal/signal.h')
| -rw-r--r-- | signal/signal.h | 72 |
1 files changed, 38 insertions, 34 deletions
diff --git a/signal/signal.h b/signal/signal.h index 588c779f11..5fb4bc2a14 100644 --- a/signal/signal.h +++ b/signal/signal.h @@ -23,8 +23,8 @@ #ifndef _SIGNAL_H #if !defined __need_sig_atomic_t && !defined __need_sigset_t -#define _SIGNAL_H 1 -#include <features.h> +# define _SIGNAL_H 1 +# include <features.h> #endif __BEGIN_DECLS @@ -47,22 +47,26 @@ typedef __sig_atomic_t sig_atomic_t; /* Type of a signal handler. */ typedef void (*__sighandler_t) __P ((int)); -/* Set the handler for the signal SIG to HANDLER, returning the old - handler, or SIG_ERR on error. - By default `signal' has the BSD semantic. */ -extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler)); - /* The X/Open definition of `signal' specifies the SVID semantic. Use the additional function `sysv_signal' when X/Open compatibility is requested. */ extern __sighandler_t __sysv_signal __P ((int __sig, __sighandler_t __handler)); -#if defined __USE_XOPEN && !defined __USE_GNU -extern __sighandler_t sysv_signal __P ((int __sig, __sighandler_t __handler)); - -/* Make sure the used `signal' implementation is the SVID version. */ -#define signal(sig, handler) __sysv_signal ((sig), (handler)) +/* Set the handler for the signal SIG to HANDLER, returning the old + handler, or SIG_ERR on error. + By default `signal' has the BSD semantic. */ +#if !defined __USE_XOPEN || defined __USE_GNU +extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler)); +#else +/* Make sure the used `signal' implementation is the SVID version. + When GNU CC is used we have a clean way to write this. */ +# if defined __GNUC__ && __GNUC__ >= 2 +extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler)) + __asm__ ("__sysv_signal"); +# else +# define signal(sig, handler) __sysv_signal ((sig), (handler)) +# endif #endif #ifdef __USE_XOPEN @@ -120,17 +124,17 @@ extern int __sigpause __P ((int __sig_or_mask, int __is_sig)); /* Set the mask of blocked signals to MASK, wait for a signal to arrive, and then restore the mask. */ extern int sigpause __P ((int __mask)); -#define sigpause(mask) __sigpause ((mask), 0) +# define sigpause(mask) __sigpause ((mask), 0) #else -#ifdef __USE_XOPEN +# ifdef __USE_XOPEN /* Remove a signal from the signal mask and suspend the process. */ -#define sigpause(sig) __sigpause ((sig), 1) -#endif +# define sigpause(sig) __sigpause ((sig), 1) +# endif #endif #ifdef __USE_BSD -#define sigmask(sig) __sigmask(sig) +# define sigmask(sig) __sigmask(sig) extern int sigblock __P ((int __mask)); extern int sigsetmask __P ((int __mask)); @@ -142,7 +146,7 @@ extern int siggetmask __P ((void)); #ifdef __USE_MISC -#define NSIG _NSIG +# define NSIG _NSIG #endif #ifdef __USE_GNU @@ -159,14 +163,14 @@ typedef __sighandler_t sig_t; #ifdef __USE_POSIX -#if !defined __sigset_t_defined \ +# if !defined __sigset_t_defined \ && (defined _SIGNAL_H || defined __need_sigset_t) typedef __sigset_t sigset_t; -#define __sigset_t_defined 1 -#endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */ -#undef __need_sigset_t +# define __sigset_t_defined 1 +# endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */ +# undef __need_sigset_t -#ifdef _SIGNAL_H +# ifdef _SIGNAL_H /* Clear all signals from SET. */ extern int sigemptyset __P ((sigset_t *__set)); @@ -183,7 +187,7 @@ extern int sigdelset __P ((sigset_t *__set, int __signo)); /* Return 1 if SIGNO is in SET, 0 if not. */ extern int sigismember __P ((__const sigset_t *__set, int __signo)); -#ifdef __USE_GNU +# ifdef __USE_GNU /* Return non-empty value is SET is not empty. */ extern int sigisemptyset __P ((__const sigset_t *__set)); @@ -194,11 +198,11 @@ extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left, /* Build new signal set by combining the two inputs set using logical OR. */ extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left, __const sigset_t *__right)); -#endif /* GNU */ +# endif /* GNU */ /* Get the system-specific definitions of `struct sigaction' and the `SA_*' and `SIG_*'. constants. */ -#include <bits/sigaction.h> +# include <bits/sigaction.h> /* Get and/or change the set of blocked signals. */ extern int __sigprocmask __P ((int __how, @@ -225,7 +229,7 @@ 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)); -#endif /* <signal.h> included. */ +# endif /* <signal.h> included. */ #endif /* Use POSIX. */ @@ -243,13 +247,13 @@ struct sigvec int sv_mask; /* Mask of signals to be blocked. */ int sv_flags; /* Flags (see below). */ -#define sv_onstack sv_flags /* 4.2 BSD compatibility. */ +# define sv_onstack sv_flags /* 4.2 BSD compatibility. */ }; /* Bits in `sv_flags'. */ -#define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */ -#define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */ -#define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */ +# define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */ +# define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */ +# define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */ /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member @@ -264,7 +268,7 @@ extern int sigvec __P ((int __sig, __const struct sigvec *__vec, /* Get machine-dependent `struct sigcontext' and signal subcodes. */ -#include <bits/sigcontext.h> +# include <bits/sigcontext.h> /* Restore the state saved in SCP. */ extern int __sigreturn __P ((struct sigcontext *__scp)); @@ -275,8 +279,8 @@ extern int sigreturn __P ((struct sigcontext *__scp)); #if defined _SIGNAL_H && (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) -#define __need_size_t -#include <stddef.h> +# define __need_size_t +# include <stddef.h> /* If INTERRUPT is nonzero, make signal SIG interrupt system calls (causing them to fail with EINTR); if INTERRUPT is zero, make system |