diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sigaction.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sigaction.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/sysdeps/unix/sysv/linux/sigaction.c b/sysdeps/unix/sysv/linux/sigaction.c index a5580cc0e6..40f9bbc252 100644 --- a/sysdeps/unix/sysv/linux/sigaction.c +++ b/sysdeps/unix/sysv/linux/sigaction.c @@ -23,20 +23,27 @@ #include <sysdep.h> #include <sys/syscall.h> +#include "kernel-features.h" + /* The difference here is that the sigaction structure used in the kernel is not the same as we use in the libc. Therefore we must translate it here. */ #include <kernel_sigaction.h> +#if __ASSUME_REALTIME_SIGNALS == 0 +/* The variable is shared between all wrappers around signal handling + functions which have RT equivalents. This is the definition. */ +int __libc_missing_rt_sigs; + extern int __syscall_sigaction (int, const struct old_kernel_sigaction *, struct old_kernel_sigaction *); +# define rtsignals_guaranteed 0 +#else +# define rtsignals_guaranteed 1 +#endif extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *, struct kernel_sigaction *, size_t); -/* The variable is shared between all wrappers around signal handling - functions which have RT equivalents. This is the definition. */ -int __libc_missing_rt_sigs; - /* If ACT is not NULL, change the action for SIG to *ACT. If OACT is not NULL, put the old action for SIG in *OACT. */ @@ -49,12 +56,18 @@ __sigaction (sig, act, oact) struct old_kernel_sigaction k_sigact, k_osigact; int result; -#ifdef __NR_rt_sigaction +#if defiend __NR_rt_sigaction || __ASSUME_REALTIME_SIGNALS > 0 /* First try the RT signals. */ +# if __ASSUME_REALTIME_SIGNALS == 0 if (!__libc_missing_rt_sigs) +# endif { struct kernel_sigaction kact, koact; + /* Save the current error value for later. We need not do this + if we are guaranteed to have realtime signals. */ +# if __ASSUME_REALTIME_SIGNALS == 0 int saved_errno = errno; +# endif if (act) { @@ -71,7 +84,9 @@ __sigaction (sig, act, oact) result = INLINE_SYSCALL (rt_sigaction, 4, sig, act ? &kact : NULL, oact ? &koact : NULL, _NSIG / 8); +# if __ASSUME_REALTIME_SIGNALS == 0 if (result >= 0 || errno != ENOSYS) +# endif { if (oact && result >= 0) { @@ -85,19 +100,22 @@ __sigaction (sig, act, oact) return result; } +# if __ASSUME_REALTIME_SIGNALS == 0 __set_errno (saved_errno); __libc_missing_rt_sigs = 1; +# endif } #endif +#if __ASSUME_REALTIME_SIGNALS == 0 if (act) { k_sigact.k_sa_handler = act->sa_handler; k_sigact.sa_mask = act->sa_mask.__val[0]; k_sigact.sa_flags = act->sa_flags; -#ifdef HAVE_SA_RESTORER +# ifdef HAVE_SA_RESTORER k_sigact.sa_restorer = act->sa_restorer; -#endif +# endif } result = INLINE_SYSCALL (sigaction, 3, sig, act ? &k_sigact : NULL, oact ? &k_osigact : NULL); @@ -106,11 +124,12 @@ __sigaction (sig, act, oact) oact->sa_handler = k_osigact.k_sa_handler; oact->sa_mask.__val[0] = k_osigact.sa_mask; oact->sa_flags = k_osigact.sa_flags; -#ifdef HAVE_SA_RESTORER +# ifdef HAVE_SA_RESTORER oact->sa_restorer = k_osigact.sa_restorer; -#endif +# endif } return result; +#endif } weak_alias (__sigaction, sigaction) |