| /* |
| * Copyright (c) 1990 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms are permitted |
| * provided that the above copyright notice and this paragraph are |
| * duplicated in all such forms and that any documentation, |
| * advertising materials, and other materials related to such |
| * distribution and use acknowledge that the software was developed |
| * by the University of California, Berkeley. The name of the |
| * University may not be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* |
| FUNCTION |
| <<perror>>---print an error message on standard error |
| |
| INDEX |
| perror |
| INDEX |
| _perror_r |
| |
| ANSI_SYNOPSIS |
| #include <stdio.h> |
| void perror(char *<[prefix]>); |
| |
| void _perror_r(struct _reent *<[reent]>, char *<[prefix]>); |
| |
| TRAD_SYNOPSIS |
| #include <stdio.h> |
| void perror(<[prefix]>) |
| char *<[prefix]>; |
| |
| void _perror_r(<[reent]>, <[prefix]>) |
| struct _reent *<[reent]>; |
| char *<[prefix]>; |
| |
| DESCRIPTION |
| Use <<perror>> to print (on standard error) an error message |
| corresponding to the current value of the global variable <<errno>>. |
| Unless you use <<NULL>> as the value of the argument <[prefix]>, the |
| error message will begin with the string at <[prefix]>, followed by a |
| colon and a space (<<: >>). The remainder of the error message is one |
| of the strings described for <<strerror>>. |
| |
| The alternate function <<_perror_r>> is a reentrant version. The |
| extra argument <[reent]> is a pointer to a reentrancy structure. |
| |
| RETURNS |
| <<perror>> returns no result. |
| |
| PORTABILITY |
| ANSI C requires <<perror>>, but the strings issued vary from one |
| implementation to another. |
| |
| Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
| <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
| */ |
| |
| #include <_ansi.h> |
| #include <reent.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include "local.h" |
| |
| _VOID |
| _DEFUN(_perror_r, (ptr, s), |
| struct _reent *ptr _AND |
| _CONST char *s) |
| { |
| char *error; |
| |
| _REENT_SMALL_CHECK_INIT (ptr); |
| if (s != NULL && *s != '\0') |
| { |
| fputs (s, _stderr_r (ptr)); |
| fputs (": ", _stderr_r (ptr)); |
| } |
| |
| if ((error = strerror (ptr->_errno)) != NULL) |
| fputs (error, _stderr_r (ptr)); |
| |
| fputc ('\n', _stderr_r (ptr)); |
| } |
| |
| #ifndef _REENT_ONLY |
| |
| _VOID |
| _DEFUN(perror, (s), |
| _CONST char *s) |
| { |
| _perror_r (_REENT, s); |
| } |
| |
| #endif |