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* [Bug libc/749] New: sigaction() and signal() misbehave
@ 2005-02-17 14:52 sebastien dot decugis at ext dot bull dot net
2005-02-17 14:54 ` [Bug libc/749] " sebastien dot decugis at ext dot bull dot net
2005-02-17 23:34 ` roland at gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: sebastien dot decugis at ext dot bull dot net @ 2005-02-17 14:52 UTC (permalink / raw)
To: glibc-bugs
The Single Unix Specification requires that a signal handler set with signal()
can be saved then restored with sigaction. Using this feature results in the
signal not being caught.
--
Summary: sigaction() and signal() misbehave
Product: glibc
Version: 2.3.4
Status: NEW
Severity: normal
Priority: P3
Component: libc
AssignedTo: gotom at debian dot or dot jp
ReportedBy: sebastien dot decugis at ext dot bull dot net
CC: glibc-bugs at sources dot redhat dot com
http://sources.redhat.com/bugzilla/show_bug.cgi?id=749
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* [Bug libc/749] sigaction() and signal() misbehave
2005-02-17 14:52 [Bug libc/749] New: sigaction() and signal() misbehave sebastien dot decugis at ext dot bull dot net
@ 2005-02-17 14:54 ` sebastien dot decugis at ext dot bull dot net
2005-02-17 23:34 ` roland at gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: sebastien dot decugis at ext dot bull dot net @ 2005-02-17 14:54 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From sebastien dot decugis at ext dot bull dot net 2005-02-17 14:53 -------
Created an attachment (id=411)
--> (http://sources.redhat.com/bugzilla/attachment.cgi?id=411&action=view)
testcase for this bug
This file demonstrate the bug.
--
http://sources.redhat.com/bugzilla/show_bug.cgi?id=749
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* [Bug libc/749] sigaction() and signal() misbehave
2005-02-17 14:52 [Bug libc/749] New: sigaction() and signal() misbehave sebastien dot decugis at ext dot bull dot net
2005-02-17 14:54 ` [Bug libc/749] " sebastien dot decugis at ext dot bull dot net
@ 2005-02-17 23:34 ` roland at gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: roland at gnu dot org @ 2005-02-17 23:34 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From roland at gnu dot org 2005-02-17 23:33 -------
POSIX says that it's implementation-defined whether delivery of a signal whose
handler was set with `signal' has the effect of signal(signo, SIG_DFL) before
running the handler, or not. Resetting the handler is the traditional SYSV
behavior of `signal', and not resetting it is the traditional BSD behavior.
In glibc, you get the SYSV style when you use some feature macros like
_POSIX_C_SOURCE, but don't also use _BSD_SOURCE or _GNU_SOURCE. If you use
_GNU_SOURCE or you do not define any _*_SOURCE macros at all, then you will get
the BSD behavior. The function `bsd_signal' is available if you use
_XOPEN_SOURCE or _GNU_SOURCE; this is the `signal' that does not reset the
handler, which `signal' gets you under _GNU_SOURCE. Since your test program
defines _POSIX_C_SOURCE, it gets the sysv_signal flavor instead. The only way
to be POSIX-compliant here is not to rely on `signal' one way or the other, and
instead stick to using `sigaction'.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
http://sources.redhat.com/bugzilla/show_bug.cgi?id=749
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2005-02-17 14:52 [Bug libc/749] New: sigaction() and signal() misbehave sebastien dot decugis at ext dot bull dot net
2005-02-17 14:54 ` [Bug libc/749] " sebastien dot decugis at ext dot bull dot net
2005-02-17 23:34 ` roland at gnu dot org
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