NAME
strerror,
strerror_r —
get error message string
SYNOPSIS
#include
<string.h>
char *
strerror(int
errnum);
int
strerror_r(int
errnum, char
*strerrbuf, size_t
buflen);
DESCRIPTION
The
strerror()
and strerror_r() functions map the error number
errnum to a language-dependent error message
string.
strerror()
returns a string containing a maximum of NL_TEXTMAX
characters, including the trailing NUL. This string is not to be modified by
the calling program, but may be overwritten by subsequent calls to
strerror().
strerror_r()
is a thread safe version of strerror() that places
the error message in the specified buffer
strerrbuf.
RETURN VALUES
strerror() returns a pointer to the error
message string. If an error occurs, the error code is stored in
errno.
strerror_r() returns zero upon successful
completion. If an error occurs, the error code is stored in
errno and the error code is returned.
ERRORS
strerror() and
strerror_r() may fail if:
- [
EINVAL] - errnum is not a valid error number. The returned error string will consist of an error message that includes errnum.
strerror_r() may fail if:
- [
ERANGE] - The error message is larger than buflen characters. The message will be truncated to fit.
SEE ALSO
STANDARDS
The strerror() function conforms to
ISO/IEC 9899:1999 (“ISO C99”).
The strerror_r() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The strerror() function first appeared in
4.3BSD-Reno. The
strerror_r() function first appeared in
OpenBSD 3.3.