1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)herror.c 6.6 (Berkeley) 02/24/91"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/uio.h> 14 #include <netdb.h> 15 #include <unistd.h> 16 #include <string.h> 17 18 char *h_errlist[] = { 19 "Error 0", 20 "Unknown host", /* 1 HOST_NOT_FOUND */ 21 "Host name lookup failure", /* 2 TRY_AGAIN */ 22 "Unknown server error", /* 3 NO_RECOVERY */ 23 "No address associated with name", /* 4 NO_ADDRESS */ 24 }; 25 int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) }; 26 27 extern int h_errno; 28 29 /* 30 * herror -- 31 * print the error indicated by the h_errno value. 32 */ 33 void 34 herror(s) 35 const char *s; 36 { 37 struct iovec iov[4]; 38 register struct iovec *v = iov; 39 40 if (s && *s) { 41 v->iov_base = (char *)s; 42 v->iov_len = strlen(s); 43 v++; 44 v->iov_base = ": "; 45 v->iov_len = 2; 46 v++; 47 } 48 v->iov_base = (u_int)h_errno < h_nerr ? 49 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(STDERR_FILENO, iov, (v - iov) + 1); 55 } 56