perror(S)
perror --
system error messages
Syntax
cc . . . -lc
#include <stdio.h>
void perror (const char *s);
extern int errno;
Description
The
perror
function
produces a language-dependent message on the standard error output,
describing the last error encountered
during a call to a system or library function.
The argument string
s
is printed first, then a colon and a blank, then the message and a new-line.
(However, if s is a null pointer
or points to a null string, the colon is not printed.)
To be of most use, the argument string should include the name
of the program that incurred the error.
The error number is taken from the external variable
errno,
which is set when errors occur but not cleared when
non-erroneous calls are made.
The contents of the error message strings are the same as
those returned by the
strerror(S)
function with argument errno.
See also
Intro(S),
strerror(S)
Standards conformance
errno is conformant with:
X/Open CAE Specification, System Interfaces and Headers, Issue 4, 1992
;
IEEE POSIX Std 1003.1-1990 System Application Program Interface (API) [C Language] (ISO/IEC 9945-1)
;
and
NIST FIPS 151-1
.
perror is conformant with:
X/Open CAE Specification, System Interfaces and Headers, Issue 4, 1992
;
ANSI X3.159-1989 Programming Language -- C
;
IEEE POSIX Std 1003.1-1990 System Application Program Interface (API) [C Language] (ISO/IEC 9945-1)
;
and
NIST FIPS 151-1
.
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003