common/irs/gai_strerror.c

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * 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 ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

#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 */
#ifndef LIBBIND_MUTEX_INITIALIZER
#define LIBBIND_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#endif
    static pthread_mutex_t lock = LIBBIND_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) {
                if (pthread_mutex_lock(&lock) != 0)
            goto unknown;
                if (!once) {
                        if (pthread_key_create(&key, free) != 0) {
                (void)pthread_mutex_unlock(&lock);
                goto unknown;
            }
            once = 1;
        }
                if (pthread_mutex_unlock(&lock) != 0)
            goto unknown;
        }

    buf = pthread_getspecific(key);
        if (buf == NULL) {
        buf = malloc(EAI_BUFSIZE);
                if (buf == NULL)
                        goto unknown;
                if (pthread_setspecific(key, buf) != 0) {
            free(buf);
            goto unknown;
        }
        }
#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);

#ifdef DO_PTHREADS
 unknown:
    return ("unknown error");
#endif
}

/*! \file */