2003-06-14 16:35:42 +02:00
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/*-------------------------------------------------------------------------
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*
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* threads.c
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*
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* Prototypes and macros around system calls, used to help make
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* threaded libraries reentrant and safe to use from threaded applications.
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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*
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2003-08-08 04:46:40 +02:00
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* $Id: thread.c,v 1.1 2003/08/08 02:46:40 momjian Exp $
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2003-06-14 16:35:42 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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/*
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* Wrapper around strerror and strerror_r to use the former if it is
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* available and also return a more useful value (the error string).
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*/
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char *
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pqStrerror(int errnum, char *strerrbuf, size_t buflen)
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{
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#if defined(USE_THREADS) && defined(HAVE_STRERROR_R)
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/* reentrant strerror_r is available */
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/* some early standards had strerror_r returning char * */
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strerror_r(errnum, strerrbuf, buflen);
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return (strerrbuf);
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#else
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/* no strerror_r() available, just use strerror */
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return strerror(errnum);
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#endif
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}
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/*
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* Wrapper around getpwuid() or getpwuid_r() to mimic POSIX getpwuid_r()
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* behaviour, if it is not available.
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*/
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int
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pqGetpwuid(uid_t uid, struct passwd * resultbuf, char *buffer,
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size_t buflen, struct passwd ** result)
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{
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#if defined(USE_THREADS) && defined(HAVE_GETPWUID_R)
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2003-08-04 02:43:34 +02:00
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2003-06-14 16:35:42 +02:00
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/*
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* broken (well early POSIX draft) getpwuid_r() which returns 'struct
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* passwd *'
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*/
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*result = getpwuid_r(uid, resultbuf, buffer, buflen);
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#else
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/* no getpwuid_r() available, just use getpwuid() */
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*result = getpwuid(uid);
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#endif
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return (*result == NULL) ? -1 : 0;
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}
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/*
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* Wrapper around gethostbyname() or gethostbyname_r() to mimic
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* POSIX gethostbyname_r() behaviour, if it is not available.
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*/
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int
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pqGethostbyname(const char *name,
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struct hostent * resbuf,
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char *buf, size_t buflen,
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struct hostent ** result,
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int *herrno)
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{
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#if defined(USE_THREADS) && defined(HAVE_GETHOSTBYNAME_R)
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2003-08-04 02:43:34 +02:00
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2003-06-14 16:35:42 +02:00
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/*
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* broken (well early POSIX draft) gethostbyname_r() which returns
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* 'struct hostent *'
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*/
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*result = gethostbyname_r(name, resbuf, buf, buflen, herrno);
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return (*result == NULL) ? -1 : 0;
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#else
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/* no gethostbyname_r(), just use gethostbyname() */
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*result = gethostbyname(name);
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if (*result != NULL)
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return 0;
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else
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{
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*herrno = h_errno;
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return -1;
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}
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#endif
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}
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