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/*-------------------------------------------------------------------------
*
* threads.c
*
* Prototypes and macros around system calls, used to help make
* threaded libraries reentrant and safe to use from threaded applications.
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
*
* $Id: threads.c,v 1.2 2003/08/04 00:43:33 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
/*
* Wrapper around strerror and strerror_r to use the former if it is
* available and also return a more useful value (the error string).
*/
char *
pqStrerror(int errnum, char *strerrbuf, size_t buflen)
{
#if defined(USE_THREADS) && defined(HAVE_STRERROR_R)
/* reentrant strerror_r is available */
/* some early standards had strerror_r returning char * */
strerror_r(errnum, strerrbuf, buflen);
return (strerrbuf);
#else
/* no strerror_r() available, just use strerror */
return strerror(errnum);
#endif
}
/*
* Wrapper around getpwuid() or getpwuid_r() to mimic POSIX getpwuid_r()
* behaviour, if it is not available.
*/
int
pqGetpwuid(uid_t uid, struct passwd * resultbuf, char *buffer,
size_t buflen, struct passwd ** result)
{
#if defined(USE_THREADS) && defined(HAVE_GETPWUID_R)
/*
* broken (well early POSIX draft) getpwuid_r() which returns 'struct
* passwd *'
*/
*result = getpwuid_r(uid, resultbuf, buffer, buflen);
#else
/* no getpwuid_r() available, just use getpwuid() */
*result = getpwuid(uid);
#endif
return (*result == NULL) ? -1 : 0;
}
/*
* Wrapper around gethostbyname() or gethostbyname_r() to mimic
* POSIX gethostbyname_r() behaviour, if it is not available.
*/
int
pqGethostbyname(const char *name,
struct hostent * resbuf,
char *buf, size_t buflen,
struct hostent ** result,
int *herrno)
{
#if defined(USE_THREADS) && defined(HAVE_GETHOSTBYNAME_R)
/*
* broken (well early POSIX draft) gethostbyname_r() which returns
* 'struct hostent *'
*/
*result = gethostbyname_r(name, resbuf, buf, buflen, herrno);
return (*result == NULL) ? -1 : 0;
#else
/* no gethostbyname_r(), just use gethostbyname() */
*result = gethostbyname(name);
if (*result != NULL)
return 0;
else
{
*herrno = h_errno;
return -1;
}
#endif
}
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