_get_errno
Gets the current value of the errno global variable.
Syntax
errno_t _get_errno(
int * pValue
);
Parameters
pValue
A pointer to an integer to be filled with the current value of the errno variable.
Return value
Returns zero if successful; an error code on failure. If pValue is NULL, the invalid parameter handler is invoked as described in Parameter validation. If execution is allowed to continue, this function sets errno to EINVAL and returns EINVAL.
Remarks
Possible values of errno are defined in Errno.h. Also, see errno constants.
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Example
// crt_get_errno.c
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <stdio.h>
#include <sys/stat.h>
int main()
{
errno_t err;
int pfh;
_sopen_s(&pfh, "nonexistent.file", _O_WRONLY, _SH_DENYNO, _S_IWRITE);
_get_errno(&err);
printf("errno = %d\n", err);
printf("fyi, ENOENT = %d\n", ENOENT);
}
errno = 2
fyi, ENOENT = 2
Requirements
| Routine | Required header | Optional header |
|---|---|---|
_get_errno |
<stdlib.h> | <errno.h> |
For more compatibility information, see Compatibility.