Date: Tue, 15 Dec 1998 15:16:30 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Dan Nelson <dnelson@emsphone.com> Cc: David Wolfskill <dhw@whistle.com>, ambrisko@whistle.com, hackers@FreeBSD.ORG Subject: Re: bin/8183 Message-ID: <199812152316.PAA60759@apollo.backplane.com> References: <199812151945.LAA09463@pau-amma.whistle.com> <199812151950.LAA59883@apollo.backplane.com> <19981215154146.A46153@emsphone.com>
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:> I wonder... does exec() clear blocked signals? I assumed it did.
:> Anyone know for sure?
:
:It does not. manpage for signal(3):
:
: When a process which has installed signal handlers forks, the
: child process inherits the signals. All caught signals may be
: reset to their default action by a call to the execve(2) function;
: ignored signals remain ignored.
:
:Note that this affects any background program run via "nohup" also. If
:you run "nohup program &", don't expect to be able to kill -HUP it
: -Dan Nelson
: dnelson@emsphone.com
man page for execve. blocked signals definitely remain blocked. oops!
Signals set to be ignored in the calling process are set to be ignored in
the new process. Signals which are set to be caught in the calling pro-
cess image are set to default action in the new process image. Blocked
signals remain blocked regardless of changes to the signal action. The
signal stack is reset to be undefined (see sigaction(2) for more informa-
tion).
-Matt
Matthew Dillon Engineering, HiWay Technologies, Inc. & BEST Internet
Communications & God knows what else.
<dillon@backplane.com> (Please include original email in any response)
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