projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1987 Regents of the University of California. | |
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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. | |
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11 | */ |
| 12 | ||
| ebfe7813 | 13 | #if defined(LIBC_SCCS) && !defined(lint) |
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14 | static char sccsid[] = "@(#)herror.c 6.2 (Berkeley) %G%"; |
| 15 | #endif /* LIBC_SCCS and not lint */ | |
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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 | } |