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Standard library header <errno.h>

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< c‎ | header

Compiler support

Program utilities

Variadic function support

Dynamic memory management

Strings library

Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Standard Library headers

<complex.h> (C99)

<errno.h>

<fenv.h> (C99)

<inttypes.h> (C99)

<iso646.h> (C95)

<stdalign.h> (C11*)

<stdatomic.h> (C11)

<stdbit.h> (C23)

<stdbool.h> (C99*)

<stdckdint.h> (C23)

<stdint.h> (C99)

<stdmchar.h> (C29)

<stdnoreturn.h> (C11*)

<tgmath.h> (C99)

<threads.h> (C11)

<uchar.h> (C11)

<wchar.h> (C95)

<wctype.h> (C95)

This header is part of the error handling library.

[edit] Error numbers

macro which expands to POSIX-compatible thread-local error number variable
(macro variable) [edit]

E2BIG, EACCES, ..., EXDEV

macros for standard POSIX-compatible error conditions
(macro constant) [edit]

[edit] Synopsis

#define EDOM /* implementation-defined */
#define EILSEQ /* implementation-defined */
#define ERANGE /* implementation-defined */
 
#define errno /* implementation-defined */
 
// Only if the implementation defines __STDC_LIB_EXT1__ and additionally the user code
// defines __STDC_WANT_LIB_EXT1__ before any inclusion of <errno.h>:
#ifdef __STDC_WANT_LIB_EXT1__
#define __STDC_LIB_EXT1__ /* implementation-defined */
#define errno_t /* implementation-defined */
#endif

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