strerror_r—convert error number to string and copy to buffer #include <string.h>
char *strerror_r(int errnum, char *buffer, size_t n);
Description
strerror_r converts the error number errnum into a
string and copies the result into the supplied buffer for
a length up to n, including the NUL terminator. The value of
errnum is usually a copy of errno. If errnum is not a known
error number, the result is the empty string.
See strerror for how strings are mapped to errnum.
Returns
This function returns a pointer to a string. Your application must
not modify that string.
Portability
strerror_r is a GNU extension.
strerror_r requires no supporting OS subroutines.