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Error numbers

Each of the macros defined in <errno.h> expands to an integer constant expression with type int and with a unique positive value. The following constants are defined by ISO C. The implementation may define more, as long as they begin with 'E' followed by digits or uppercase letters.

- - - - -
Defined in header <errno.h>
EDOM
 Mathematics argument out of domain of function
(macro constant)
EILSEQ
-
(C95)
 Illegal byte sequence
(macro constant)
ERANGE
 Result too large
(macro constant)

Notes

Many additional errno constants are defined by POSIX and by the C++ standard library, and individual implementations may define even more, e.g. errno(3) on Linux or intro(2) on BSD and OS X.

-

Example

#include <stdio.h>
-#include <math.h>
-#include <errno.h>
-#include <string.h>
- 
-int main(void)
-{
-    errno = 0;
-    printf("log(-1.0) = %f\n", log(-1.0));
-    printf("%s\n\n",strerror(errno));
- 
-    errno = 0;
-    printf("log(0.0)  = %f\n", log(0.0));
-    printf("%s\n",strerror(errno));
-}

Possible output:

-
log(-1.0) = nan
-Numerical argument out of domain
- 
-log(0.0)  = -inf
-Numerical result out of range

References

See also

- - - -
macro which expands to POSIX-compatible thread-local error number variable
(macro variable)
displays a character string corresponding of the current error to stderr
(function)
-
(C11)(C11)
 returns a text version of a given error code
(function)
C++ documentation for Error numbers
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/error/errno_macros -

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