Error handling

Syntax

#include <errno.h>
int errno; /* implementation defined */
#include <string.h>
char *strerror(int errnum);
#include <stdio.h>
void perror(const char *s);

Remarks

Have in mind that errno is not necessarily a variable but that the syntax is only an indication how it might been declared. On many modern systems with thread interfaces errno is some macro that resolves to an object that is local to the current thread.

Found a mistake? Have a question or improvement idea? Let me know.

Error handling:

* Error handling

* errno

* strerror

* perror

Table Of Contents

0 Getting started

1 Function pointers

2 Operators

3 Data types

4 Arrays

5 Undefined behavior

6 Random numbers

7 Preprocessor and macros

8 Signal handling

9 Variable arguments

10 Files and I/O streams

11 Assertion

12 Linked lists

13 Generic selection

14 X-macros

15 Function parameters

16 Pointers

17 Structs

18 Sequence points

19 Command-line arguments

20 Aliasing and effective type

21 Compilation

22 Identifier scope

23 Bit-fields

24 Strings

25 Comman pitfalls

26 Error handling

27 Implicit and explicit conversions

28 Type qualifiers

29 Valgrind

30 Typedef

31 Selection statements

32 Declaration vs. definitio

33 Standard math

34 Boolean

35 Literals for numbers, characters and strings

36 Storage classes

37 Declarations

38 Formatted Input/Output

39 Compound literals

40 Inline assembly

41 Threads native

42 Initialization

43 Structure padding and packing

44 Memory management

45 Implementation-defined behaviour

46 Atomics

47 Iteration statements, loops, for, while, do-while

48 Enumerations

49 Jump Statements

50 Create and include header files

51 Testing frameworks

52 ctype.h characters classification

53 Pass 2D-arrays to functions

54 Side effects

55 Multi-character character sequences

56 Constrains

57 Inlining

58 Unions

59 Multi-threading

60 Common idioms and developer practices

61 Inter-process communication (IPC)

62 Comments

63 Contributors