STRERROR(3C)STRERROR(3C)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() function maps the error number in errnum to an error
message string, and returns a pointer to that string. It uses the same
set of error messages as perror(3C). The returned string should not be
overwritten.
The strerror_r() function maps the error number in errnum to anerror
message string and returns the string in the buffer pointed to by str‐
errbuf with length buflen.
RETURN VALUES
Upon successful completion, strerror() returns a pointer to the gener‐
ated message string. Otherwise, it sets errno and returns a pointer to
an error message string. It returns the string "Unknown error" if
errnum is not a valid error number.
Upon successful completion, strerror_r() returns 0. Otherwise it sets
errno and returns the value of errno to indicate the error. It returns
the string "Unknown error" in the buffer pointed to by strerrbuf if
errnum is not a valid error number.
ERRORS
These functions may fail if:
EINVAL
The value of errnum is not a valid error number.
The strerror_r() function may fail if:
ERANGE
The buflen argument specifies insufficient storage to contain
the generated message string.
USAGE
Messages returned from these functions are in the native language spec‐
ified by the LC_MESSAGES locale category. See setlocale(3C).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ Safe │
└────────────────────┴─────────────────┘
SEE ALSOgettext(3C), perror(3C), setlocale(3C), attributes(5), standards(5)
Mar 31, 2005 STRERROR(3C)