strerror(3)strerror(3)NAME
strerror, strerror_r - Access message explaining function error
SYNOPSIS
#include <string.h>
char *strerror(
int errnum );
The following function does not conform to current standards and is
supported only to maintain backward compatibility. int strerror_r(
int errnum,
char *strerrbuf,
int buflen );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
strerror(): XSH4.2
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies an error-number value. [Tru64 UNIX] Specifies a buffer that
will hold the error message. [Tru64 UNIX] Specifies the length of the
buffer.
DESCRIPTION
The strerror() function maps the error number specified by the errnum
parameter to a error message string and returns a pointer to the
string. The string pointed to by the return value is not modified by
the program, but may be overwritten by a subsequent call to this func‐
tion. The implementation behaves as though no other function calls the
strerror() function.
If a library message catalog is available for the current locale, the
strerror() function stores the message from that catalog. Otherwise, it
uses the default messages. The LC_MESSAGES category in the setlocale()
call specifies the message catalog language, and the NLSPATH environ‐
ment variable specifies the directory search path for message catalogs.
The strerror_r() function is the reentrant version of the strerror()
function. It is supported to maintain backward compatibility with oper‐
ating system versions prior to Tru64 UNIX Version 4.0.
RETURN VALUES
On successful completion, the strerror() function returns a pointer to
the generated message string. If the error number is not valid, errno
is set to indicate the error.
On successful completion, strerror_r() provides the error message in
strerrbuf, and returns a value of 0 (zero). Otherwise it returns a
value of -1.
ERRORS
The strerror() and strerror_r() functions set errno to the specified
values for the following conditions:
The errnum parameter is an invalid error number.
[Tru64 UNIX] The strerrorbuf is inaccessible to the str‐
error_r() function. Note that the strerror_r() function trun‐
cates the error message if strerrbuf is too small.
SEE ALSO
Functions: intro(2), catgets(3), catopen(3), perror(3), setlocale(3)
Standards: standards(5)strerror(3)
