Date: Mon, 5 Jan 2009 21:46:59 +0100 From: Patrick =?ISO-8859-15?Q?Lamaizi=E8re?= <patfbsd@davenulle.org> To: freebsd-questions@freebsd.org, Edward King <zhangsc@neusoft.com> Subject: Re: why printf() don't work? Message-ID: <20090105214659.125f55a2@baby-jane-lamaiziere-net.local> In-Reply-To: <022201c96f07$553b65a0$3f83a8c0@user863c0bf569> References: <022201c96f07$553b65a0$3f83a8c0@user863c0bf569>
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Le Mon, 05 Jan 2009 15:29:23 +0800,
Edward King <zhangsc@neusoft.com> a écrit :
> I use FreeBSD7.0,and use signal,like follows:
> signal(SIGHUP,sig_hup);
> signal(SIGIO,sig_io);
>
> when I run call following code,it can run,but I find a puzzled
> question,it should print some information,such as printf("execute
> main()") will print execute main(),but in fact,printf fuction print
> none!!! Why printf function do not go work?
Just to be sure :
You should not use printf() in a signal handler, it is not
considered 'signal safe'.
(See man sigaction)
Regards.
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