Date: Tue, 30 Jun 1998 13:51:39 +0200 (CEST) From: Marino Ladavac <lada@pc8811.gud.siemens.at> To: Greg Lehey <grog@lemis.com> Cc: mkn <mkn@emailbox.hdtv.lucent.com>, freebsd-questions@FreeBSD.ORG, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: Unsupport calls Message-ID: <XFMail.980630135139.lada@pc8811.gud.siemens.at> In-Reply-To: <19980630192910.H1880@freebie.lemis.com>
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On 30-Jun-98 Greg Lehey wrote:
> On Tuesday, 30 June 1998 at 9:54:10 +0200, Marino Ladavac wrote:
>>
>> On 30-Jun-98 Greg Lehey wrote:
>>>
>>>> sigwait - no support in FreeBSD.
>>>> sigset - no support in FreeBSD
>>>> sighold - no support in FreeBSD
>>>> sigrelse - no support in FreeBSD
>>>
>>> These are the System V signal functions, arguably the worst choice of
>>> the currently available signal implementations. FreeBSD has the BSD
>>> functions instead, as well as the POSIX.1 signals which were derived
>>> from them. See more about this in my book "Porting UNIX software". I
>>> recommend porting to the POSIX.1 signals, which are also supported by
>>> Solaris.
>>>
>> sigwait is in libc_r, being a part of POSIX pthread specification.
>
> That's a different sigwait. This one is, by association, one of the
> calls of the System V signals implementation.
>
I beg to differ (and so do my SunOS 5 manpages). The SysV simplified signal
management APIs are:
signal(3C) C Library Functions signal(3C)
NAME
signal, sigset, sighold, sigrelse, sigignore, sigpause -
simplified signal management for application processes
whereas:
sigwait(2) System Calls sigwait(2)
NAME
sigwait - wait until a signal is posted
SYNOPSIS
#include <signal.h>
int sigwait(sigset_t *set);
POSIX
^^^^^
cc [ flag... ] file ... - D_POSIX_PTHREAD_SEMANTICS [
^^^^^^^^^^^^^^^^^^^^^^^^^
library... ]
#include <signal.h>
int sigwait(const sigset_t *set, int *sig);
DESCRIPTION
sigwait() selects a signal in set that is pending on the
calling thread (see thr_create(3T)) or LWP. If no signal in
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It is the very same sigwait() that resides in libc_r on FreeBSD, name
similarities notwithstanding. Non-POSIX version is from the now
deprecated SunOS 5 LWP API.
> Greg
> --
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----------------------------------
Marino Ladavac
Date: 30-Jun-98
Time: 13:42:21
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