/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
#if defined(HAVE_STRERROR_R) && defined(NEEDS_STRERROR_R_DECL)
#if defined(STRERROR_R_CHAR_P)
char *strerror_r(int errnum, char *strerrbuf, size_t buflen);
#else
int strerror_r(int errnum, char *strerrbuf, size_t buflen);
#endif
#endif
/* ideally, provides a thread-safe version of strerror */
const char *MPIR_Strerror(int errnum)
{
#if defined(HAVE_STRERROR_R)
char *buf;
MPIR_Per_thread_t *per_thread = NULL;
int err = 0;
MPID_THREADPRIV_KEY_GET_ADDR(MPIR_ThreadInfo.isThreaded, MPIR_Per_thread_key,
MPIR_Per_thread, per_thread, &err);
MPIR_Assert(err == 0);
buf = per_thread->strerrbuf;
#if defined(STRERROR_R_CHAR_P)
/* strerror_r returns char ptr (old GNU-flavor). Static strings for known
* errnums are in returned buf, unknown errnums put a message in buf and
* return buf */
buf = strerror_r(errnum, buf, MPIR_STRERROR_BUF_SIZE);
#else
/* strerror_r returns an int */
strerror_r(errnum, buf, MPIR_STRERROR_BUF_SIZE);
#endif
return buf;
#elif defined(HAVE_STRERROR)
/* MT - not guaranteed to be thread-safe, but on may platforms it will be
* anyway for the most common cases (looking up an error string in a table
* of constants).
*
* Using a mutex here would be an option, but then you need a version
* without the mutex to call when interpreting errors from mutex functions
* themselves. */
return strerror(errnum);
#else
/* nowadays this case is most likely to happen because of a configure or
* internal header file inclusion bug rather than an actually missing
* strerror routine */
return "(strerror() unavailable on this platform)"
#endif
}