common/irs/gai_strerror.c

	gai_strerror.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright 1999-2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 2001 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <port_before.h>
#include <netdb.h>
#include <port_after.h>

#ifdef DO_PTHREADS
#include <pthread.h>
#include <stdlib.h>
#endif

static const char *gai_errlist[] = {
    "no error",
    "address family not supported for name",/* EAI_ADDRFAMILY */
    "temporary failure",            /* EAI_AGAIN */
    "invalid flags",            /* EAI_BADFLAGS */
    "permanent failure",            /* EAI_FAIL */
    "address family not supported",     /* EAI_FAMILY */
    "memory failure",           /* EAI_MEMORY */
    "no address",               /* EAI_NODATA */
    "unknown name or service",      /* EAI_NONAME */
    "service not supported for socktype",   /* EAI_SERVICE */
    "socktype not supported",       /* EAI_SOCKTYPE */
    "system failure",           /* EAI_SYSTEM */
    "bad hints",                /* EAI_BADHINTS */
    "bad protocol",             /* EAI_PROTOCOL */

    "unknown error"             /* Must be last. */
};

static const int gai_nerr = (sizeof(gai_errlist)/sizeof(*gai_errlist));

#define EAI_BUFSIZE 128

const char *
gai_strerror(int ecode) {
#ifndef DO_PTHREADS
    static char buf[EAI_BUFSIZE];
#else   /* DO_PTHREADS */
    static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
    static pthread_key_t key;
    static int once = 0;
    char *buf;
#endif

    if (ecode >= 0 && ecode < (gai_nerr - 1))
        return (gai_errlist[ecode]);

#ifdef DO_PTHREADS
        if (!once) {
                pthread_mutex_lock(&lock);
                if (!once++)
                        pthread_key_create(&key, free);
                pthread_mutex_unlock(&lock);
        }

    buf = pthread_getspecific(key);
        if (buf == NULL) {
        buf = malloc(EAI_BUFSIZE);
                if (buf == NULL)
                        return ("unknown error");
                pthread_setspecific(key, buf);
        }
#endif
    /*
     * XXX This really should be snprintf(buf, EAI_BUFSIZE, ...).
     * It is safe until message catalogs are used.
     */
    sprintf(buf, "%s: %d", gai_errlist[gai_nerr - 1], ecode);
    return (buf);
}