/* A GNU-like <signal.h>.
- Copyright (C) 2006-2008 Free Software Foundation, Inc.
+ Copyright (C) 2006-2010 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#ifndef _GL_SIGNAL_H
#define _GL_SIGNAL_H
-/* The definition of GL_LINK_WARNING is copied here. */
+/* The definition of _GL_ARG_NONNULL is copied here. */
+
+/* The definition of _GL_WARN_ON_USE is copied here. */
/* Define pid_t, uid_t.
Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
#include <sys/types.h>
+/* On AIX, sig_atomic_t already includes volatile. C99 requires that
+ 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not.
+ Hence, redefine this to a non-volatile type as needed. */
+#if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@
+typedef int rpl_sig_atomic_t;
+# undef sig_atomic_t
+# define sig_atomic_t rpl_sig_atomic_t
+#endif
+
+/* A set or mask of signals. */
+#if !@HAVE_SIGSET_T@
+typedef unsigned int sigset_t;
+#endif
+
#ifdef __cplusplus
extern "C" {
#endif
#endif
-#if !@HAVE_POSIX_SIGNALBLOCKING@
+#if @GNULIB_SIGPROCMASK@
+# if !@HAVE_POSIX_SIGNALBLOCKING@
/* Maximum signal number + 1. */
-# ifndef NSIG
-# define NSIG 32
-# endif
+# ifndef NSIG
+# define NSIG 32
+# endif
/* This code supports only 32 signals. */
typedef int verify_NSIG_constraint[2 * (NSIG <= 32) - 1];
-/* A set or mask of signals. */
-# if !@HAVE_SIGSET_T@
-typedef unsigned int sigset_t;
-# endif
-
/* Test whether a given signal is contained in a signal set. */
-extern int sigismember (const sigset_t *set, int sig);
+extern int sigismember (const sigset_t *set, int sig) _GL_ARG_NONNULL ((1));
/* Initialize a signal set to the empty set. */
-extern int sigemptyset (sigset_t *set);
+extern int sigemptyset (sigset_t *set) _GL_ARG_NONNULL ((1));
/* Add a signal to a signal set. */
-extern int sigaddset (sigset_t *set, int sig);
+extern int sigaddset (sigset_t *set, int sig) _GL_ARG_NONNULL ((1));
/* Remove a signal from a signal set. */
-extern int sigdelset (sigset_t *set, int sig);
+extern int sigdelset (sigset_t *set, int sig) _GL_ARG_NONNULL ((1));
/* Fill a signal set with all possible signals. */
-extern int sigfillset (sigset_t *set);
+extern int sigfillset (sigset_t *set) _GL_ARG_NONNULL ((1));
/* Return the set of those blocked signals that are pending. */
-extern int sigpending (sigset_t *set);
+extern int sigpending (sigset_t *set) _GL_ARG_NONNULL ((1));
/* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
Then, if SET is not NULL, affect the current set of blocked signals by
combining it with *SET as indicated in OPERATION.
In this implementation, you are not allowed to change a signal handler
while the signal is blocked. */
-# define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
-# define SIG_SETMASK 1 /* blocked_set = *set; */
-# define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
+# define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
+# define SIG_SETMASK 1 /* blocked_set = *set; */
+# define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set);
-# define signal rpl_signal
+# define signal rpl_signal
/* Install the handler FUNC for signal SIG, and return the previous
handler. */
extern void (*signal (int sig, void (*func) (int))) (int);
-# if GNULIB_defined_SIGPIPE
+# if GNULIB_defined_SIGPIPE
/* Raise signal SIG. */
-# undef raise
-# define raise rpl_raise
+# undef raise
+# define raise rpl_raise
extern int raise (int sig);
-# endif
+# endif
-#endif /* !@HAVE_POSIX_SIGNALBLOCKING@ */
+# endif /* !@HAVE_POSIX_SIGNALBLOCKING@ */
+#elif defined GNULIB_POSIXCHECK
+# undef sigaddset
+# if HAVE_RAW_DECL_SIGADDSET
+_GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigdelset
+# if HAVE_RAW_DECL_SIGDELSET
+_GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigemptyset
+# if HAVE_RAW_DECL_SIGEMPTYSET
+_GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigfillset
+# if HAVE_RAW_DECL_SIGFILLSET
+_GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigismember
+# if HAVE_RAW_DECL_SIGISMEMBER
+_GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigpending
+# if HAVE_RAW_DECL_SIGPENDING
+_GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigprocmask
+# if HAVE_RAW_DECL_SIGPROCMASK
+_GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
+ "use the gnulib module sigprocmask for portability");
+# endif
+#endif /* @GNULIB_SIGPROCMASK@ */
-#if !@HAVE_SIGACTION@
+#if @GNULIB_SIGACTION@
+# if !@HAVE_SIGACTION@
-# if !@HAVE_SIGINFO_T@
+# if !@HAVE_SIGINFO_T@
/* Present to allow compilation, but unsupported by gnulib. */
union sigval
{
union sigval si_value;
};
typedef struct siginfo_t siginfo_t;
-# endif /* !@HAVE_SIGINFO_T@ */
+# endif /* !@HAVE_SIGINFO_T@ */
/* We assume that platforms which lack the sigaction() function also lack
the 'struct sigaction' type, and vice versa. */
/* Not all POSIX flags are supported. */
int sa_flags;
};
-# define sa_handler _sa_func._sa_handler
-# define sa_sigaction _sa_func._sa_sigaction
+# define sa_handler _sa_func._sa_handler
+# define sa_sigaction _sa_func._sa_sigaction
/* Unsupported flags are not present. */
-# define SA_RESETHAND 1
-# define SA_NODEFER 2
-# define SA_RESTART 4
+# define SA_RESETHAND 1
+# define SA_NODEFER 2
+# define SA_RESTART 4
extern int sigaction (int, const struct sigaction *restrict,
struct sigaction *restrict);
-#elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
+# elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
+
+# define sa_sigaction sa_handler
-# define sa_sigaction sa_handler
+# endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
+#elif defined GNULIB_POSIXCHECK
+# undef sigaction
+# if HAVE_RAW_DECL_SIGACTION
+_GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
+ "use the gnulib module sigaction for portability");
+# endif
+#endif
-#endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
+/* Some systems don't have SA_NODEFER. */
+#ifndef SA_NODEFER
+# define SA_NODEFER 0
+#endif
#ifdef __cplusplus
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