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fatal-signal improvement
From: |
Bruno Haible |
Subject: |
fatal-signal improvement |
Date: |
Sun, 31 Aug 2008 16:07:16 +0200 |
User-agent: |
KMail/1.5.4 |
This commit makes it possible for an application to install a handler for a
fatal signal (e.g. SIGPIPE) and use the 'fatal-signal' module nevertheless.
2008-08-31 Bruno Haible <address@hidden>
Don't override previously installed signal handlers.
* lib/fatal-signal.c (saved_sigactions): New variable.
(uninstall_handlers): Reset the signal to the saved handler, not
to SIG_DFL (except when ignored).
(install_handlers): Save the previous handlers.
*** lib/fatal-signal.c.orig 2008-08-31 16:00:32.000000000 +0200
--- lib/fatal-signal.c 2008-08-31 12:43:43.000000000 +0200
***************
*** 125,143 ****
static size_t actions_allocated = SIZEOF (static_actions);
/* Uninstall the handlers. */
static inline void
uninstall_handlers ()
{
size_t i;
- struct sigaction action;
- action.sa_handler = SIG_DFL;
- action.sa_flags = 0;
- sigemptyset (&action.sa_mask);
for (i = 0; i < num_fatal_signals; i++)
if (fatal_signals[i] >= 0)
! sigaction (fatal_signals[i], &action, NULL);
}
--- 125,149 ----
static size_t actions_allocated = SIZEOF (static_actions);
+ /* The saved signal handlers.
+ Size 32 would not be sufficient: On HP-UX, SIGXCPU = 33, SIGXFSZ = 34. */
+ static struct sigaction saved_sigactions[64];
+
+
/* Uninstall the handlers. */
static inline void
uninstall_handlers ()
{
size_t i;
for (i = 0; i < num_fatal_signals; i++)
if (fatal_signals[i] >= 0)
! {
! int sig = fatal_signals[i];
! if (saved_sigactions[sig].sa_handler == SIG_IGN)
! saved_sigactions[sig].sa_handler = SIG_DFL;
! sigaction (sig, &saved_sigactions[sig], NULL);
! }
}
***************
*** 184,190 ****
sigemptyset (&action.sa_mask);
for (i = 0; i < num_fatal_signals; i++)
if (fatal_signals[i] >= 0)
! sigaction (fatal_signals[i], &action, NULL);
}
--- 190,202 ----
sigemptyset (&action.sa_mask);
for (i = 0; i < num_fatal_signals; i++)
if (fatal_signals[i] >= 0)
! {
! int sig = fatal_signals[i];
!
! if (!(sig < sizeof (saved_sigactions) / sizeof (sigactions[0])))
! abort ();
! sigaction (sig, &action, &saved_sigactions[sig]);
! }
}
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