| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #if defined(LIBC_SCCS) && !defined(lint) |
| 8 | static char sccsid[] = "@(#)perror.c 5.3 (Berkeley) %G%"; |
| 9 | #endif LIBC_SCCS and not lint |
| 10 | |
| 11 | /* |
| 12 | * Print the error indicated |
| 13 | * in the cerror cell. |
| 14 | */ |
| 15 | #include <sys/types.h> |
| 16 | #include <sys/uio.h> |
| 17 | |
| 18 | int errno; |
| 19 | extern int sys_nerr; |
| 20 | extern char *sys_errlist[]; |
| 21 | perror(s) |
| 22 | char *s; |
| 23 | { |
| 24 | struct iovec iov[4]; |
| 25 | register struct iovec *v = iov; |
| 26 | |
| 27 | if (s && *s) { |
| 28 | v->iov_base = s; |
| 29 | v->iov_len = strlen(s); |
| 30 | v++; |
| 31 | v->iov_base = ": "; |
| 32 | v->iov_len = 2; |
| 33 | v++; |
| 34 | } |
| 35 | v->iov_base = errno < sys_nerr ? sys_errlist[errno] : "Unknown error"; |
| 36 | v->iov_len = strlen(v->iov_base); |
| 37 | v++; |
| 38 | v->iov_base = "\n"; |
| 39 | v->iov_len = 1; |
| 40 | writev(2, iov, (v - iov) + 1); |
| 41 | } |