1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #if defined(LIBC_SCCS) && !defined(lint) 14 static char sccsid[] = "@(#)herror.c 6.2 (Berkeley) 03/07/88"; 15 #endif /* LIBC_SCCS and not lint */ 16 17 #include <sys/types.h> 18 #include <sys/uio.h> 19 20 char *h_errlist[] = { 21 "Error 0", 22 "Unknown host", /* 1 HOST_NOT_FOUND */ 23 "Host name lookup failure", /* 2 TRY_AGAIN */ 24 "Unknown server error", /* 3 NO_RECOVERY */ 25 "No address associated with name", /* 4 NO_ADDRESS */ 26 }; 27 int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) }; 28 29 extern int h_errno; 30 31 /* 32 * herror -- 33 * print the error indicated by the h_errno value. 34 */ 35 herror(s) 36 char *s; 37 { 38 struct iovec iov[4]; 39 register struct iovec *v = iov; 40 41 if (s && *s) { 42 v->iov_base = s; 43 v->iov_len = strlen(s); 44 v++; 45 v->iov_base = ": "; 46 v->iov_len = 2; 47 v++; 48 } 49 v->iov_base = h_errno < h_nerr ? h_errlist[h_errno] : "Unknown error"; 50 v->iov_len = strlen(v->iov_base); 51 v++; 52 v->iov_base = "\n"; 53 v->iov_len = 1; 54 writev(2, iov, (v - iov) + 1); 55 } 56