Error handling - cppreference.com (original) (raw)

[edit] Error numbers

[edit] Assertions
Bounds checking The standard library provides bounds-checked versions of some existing functions (gets_s, fopen_s, printf_s, strcpy_s, wcscpy_s, mbstowcs_s, qsort_s, getenv_s, etc). This functionality is optional and is only available if __STDC_LIB_EXT1__ is defined. The following macros and functions support this functionality. Defined in header <errno.h> Defined in header <stdio.h> errno_t(C11) a typedef for the type int, used to self-document functions that return errno values (typedef) Defined in header <stddef.h> Defined in header <stdio.h> Defined in header <stdlib.h> Defined in header <string.h> Defined in header <time.h> Defined in header <wchar.h> rsize_t(C11) a typedef for the same type as size_t, used to self-document functions that range-check their parameters at runtime (typedef) Defined in header <stdint.h> RSIZE_MAX(C11) largest acceptable size for bounds-checked functions, expands to either constant or variable which may change at runtime (e.g. as the currently allocated memory size changes)(macro variable) Defined in header <stdlib.h> set_constraint_handler_s(C11) set the error callback for bounds-checked functions (function) [edit] abort_handler_s(C11) abort callback for the bounds-checked functions (function) [edit] ignore_handler_s(C11) ignore callback for the bounds-checked functions (function) [edit] Note: implementations of bounds-checked functions are available as open-source libraries Safe C and Slibc, and as part of Watcom C. There is also an incompatible set of bounds-checked functions available in Visual Studio. (since C11)

[edit] Notes

Since C23, static_assert is itself a keyword, which may also be a predefined macro, so <assert.h> no longer provides it.

[edit] References

Extended content
C23 standard (ISO/IEC 9899:2024): 7.2 Diagnostics <assert.h> (p: TBD) 7.5 Errors <errno.h> (p: TBD) 7.19 Common definitions <stddef.h> (p: TBD) 7.20 Integer types <stdint.h> (p: TBD) 7.21 Input/output <stdio.h> (p: TBD) 7.22 General utilities <stdlib.h> (p: TBD) K.3.1.3 Use of errno (p: TBD) K.3.2/2 errno_t (p: TBD) K.3.3/2 rsize_t (p: TBD) K.3.4/2 RSIZE_MAX (p: TBD) 7.31.3 Errors <errno.h> (p: TBD) 7.31.10 Integer types <stdint.h> (p: TBD) 7.31.11 Input/output <stdio.h> (p: TBD) 7.31.12 General utilities <stdlib.h> (p: TBD) C17 standard (ISO/IEC 9899:2018): 7.2 Diagnostics <assert.h> (p: TBD) 7.5 Errors <errno.h> (p: TBD) 7.19 Common definitions <stddef.h> (p: TBD) 7.20 Integer types <stdint.h> (p: TBD) 7.21 Input/output <stdio.h> (p: TBD) 7.22 General utilities <stdlib.h> (p: TBD) K.3.1.3 Use of errno (p: TBD) K.3.2/2 errno_t (p: TBD) K.3.3/2 rsize_t (p: TBD) K.3.4/2 RSIZE_MAX (p: TBD) 7.31.3 Errors <errno.h> (p: TBD) 7.31.10 Integer types <stdint.h> (p: TBD) 7.31.11 Input/output <stdio.h> (p: TBD) 7.31.12 General utilities <stdlib.h> (p: TBD) C11 standard (ISO/IEC 9899:2011): 7.2 Diagnostics <assert.h> (p: 186-187) 7.5 Errors <errno.h> (p: 205) 7.19 Common definitions <stddef.h> (p: 288) 7.20 Integer types <stdint.h> (p: 289-295) 7.21 Input/output <stdio.h> (p: 296-339) 7.22 General utilities <stdlib.h> (p: 340-360) K.3.1.3 Use of errno (p: 584) K.3.2/2 errno_t (p: 585) K.3.3/2 rsize_t (p: 585) K.3.4/2 RSIZE_MAX (p: 585) 7.31.3 Errors <errno.h> (p: 455) 7.31.10 Integer types <stdint.h> (p: 456) 7.31.11 Input/output <stdio.h> (p: 456) 7.31.12 General utilities <stdlib.h> (p: 456) C99 standard (ISO/IEC 9899:1999): 7.2 Diagnostics <assert.h> (p: 169) 7.5 Errors <errno.h> (p: 186) 7.26.3 Errors <errno.h> (p: 401) 7.26.8 Integer types <stdint.h> (p: 401) 7.26.9 Input/output <stdio.h> (p: 402) 7.26.10 General utilities <stdlib.h> (p: 402) C89/C90 standard (ISO/IEC 9899:1990): 4.2 DIAGNOSTICS <assert.h> 4.1.3 Errors <errno.h> 4.13.1 Errors <errno.h> 4.13.6 Input/output <stdio.h> 4.13.7 General utilities <stdlib.h>

[edit] See also