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