usr/src/lib/libc/net/herror.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* !lint */

#ifndef lint
static char sccsid[] = "@(#)herror.c    1.1 (Berkeley) %G%";
#endif /* !lint */

#include <sys/types.h>
#include <sys/uio.h>

char    *h_errlist[] = {
        "Error 0",
        "Unknown host",                         /* 1 HOST_NOT_FOUND */
        "Host name lookup failure",             /* 2 TRY_AGAIN */
        "Unknown server error",                 /* 3 NO_RECOVERY */
        "No address associated with name",      /* 4 NO_ADDRESS */
};
int     h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };

extern int      h_errno;

/*
 * herror --
 *      print the error indicated by the h_errno value.
 */
herror(s)
        char *s;
{
        struct iovec iov[4];
        register struct iovec *v = iov;

        if (s && *s) {
                v->iov_base = s;
                v->iov_len = strlen(s);
                v++;
                v->iov_base = ": ";
                v->iov_len = 2;
                v++;
        }
        v->iov_base = h_errno < h_nerr ? h_errlist[h_errno] : "Unknown error";
        v->iov_len = strlen(v->iov_base);
        v++;
        v->iov_base = "\n";
        v->iov_len = 1;
        writev(2, iov, (v - iov) + 1);
}