linux errno查看和使用

1. void perror(const char *s)

函数说明

perror ( )用来将上一个函数发生错误的原因输出到标准错误(stderr),参数s 所指的字符串会先打印出,后面再加上错误原因 字符串。此错误原因依照全局变量 errno 的值来决定要输出的字符串。

2.  char *strerror(int errno)

将错误代码转换为字符串错误信息。

errno 在 <errno.h> 中定义。

错误 Exx 的宏定义在 /usr/include/asm-generic 文件夹下面的  errno-base.h 和 errno.h，分别定义了 1-34 、35-132 的错误定义。

#define EPERM 1

#define ENOENT 2

#define ESRCH 3

#define EINTR 4

#define EIO  5

#define ENXIO 6

#define E2BIG 7

#define ENOEXEC  8

#define EBADF 9

#define ECHILD 10

#define EAGAIN 11

#define ENOMEM 12

#define EACCES 13

#define EFAULT 14

#define ENOTBLK 15

#define EBUSY 16

#define EEXIST 17

#define EXDEV 18

#define ENODEV 19

#define ENOTDIR 20

#define EISDIR 21

#define EINVAL 22

#define ENFILE 23

#define EMFILE 24

#define ENOTTY 25

#define ETXTBSY 26

#define EFBIG 27

#define ENOSPC 28

#define ESPIPE 29

#define EROFS 30

#define EMLINK 31

#define EPIPE 32

#define EDOM 33

#define ERANGE 34

#define EDEADLK 35

#define ENAMETOOLONG 36

#define ENOLCK 37

#define ENOSYS 38

#define ENOTEMPTY 39

#define ELOOP 40

#define EWOULDBLOCK EAGAIN

#define ENOMSG 42

#define EIDRM 43

#define ECHRNG 44

#define EL2NSYNC 45

#define EL3HLT 46

#define EL3RST 47

#define ELNRNG 48

#define EUNATCH 49

#define ENOCSI 50

#define EL2HLT 51

#define EBADE 52

#define EBADR 53

#define EXFULL 54

#define ENOANO 55

#define EBADRQC 56

#define EBADSLT 57

#define EDEADLOCK EDEADLK

#define EBFONT 59

#define ENOSTR 60

#define ENODATA 61

#define ETIME 62

#define ENOSR 63

#define ENONET 64

#define ENOPKG 65

#define EREMOTE 66

#define ENOLINK 67

#define EADV 68

#define ESRMNT 69

#define ECOMM 70

#define EPROTO 71

#define EMULTIHOP 72

#define EDOTDOT 73

#define EBADMSG 74

#define EOVERFLOW 75

#define ENOTUNIQ 76

#define EBADFD 77

#define EREMCHG 78

#define ELIBACC 79

#define ELIBBAD 80

#define ELIBSCN 81

#define ELIBMAX 82

#define ELIBEXEC 83

#define EILSEQ 84

#define ERESTART 85

#define ESTRPIPE 86

#define EUSERS 87

#define ENOTSOCK 88

#define EDESTADDRREQ 89

#define EMSGSIZE 90

#define EPROTOTYPE 91

#define ENOPROTOOPT 92

#define EPROTONOSUPPORT 93

#define ESOCKTNOSUPPORT 94

#define EOPNOTSUPP 95

#define EPFNOSUPPORT 96

#define EAFNOSUPPORT 97

#define EADDRINUSE 98

#define EADDRNOTAVAIL 99

#define ENETDOWN 100

#define ENETUNREACH 101

#define ENETRESET 102

#define ECONNABORTED 103

#define ECONNRESET 104

#define ENOBUFS 105

#define EISCONN 106

#define ENOTCONN 107

#define ESHUTDOWN 108

#define ETOOMANYREFS 109

#define ETIMEDOUT 110

#define ECONNREFUSED 111

#define EHOSTDOWN 112

#define EHOSTUNREACH 113

#define EALREADY 114

#define EINPROGRESS 115

#define ESTALE 116

#define EUCLEAN 117

#define ENOTNAM 118

#define ENAVAIL 119

#define EISNAM 120

#define EREMOTEIO 121

#define EDQUOT 122

#define ENOMEDIUM 123

#define EMEDIUMTYPE 124

#define ECANCELED 125

#define ENOKEY 126

#define EKEYEXPIRED 127

#define EKEYREVOKED 128

#define EKEYREJECTED 129

#define EOWNERDEAD 130

#define ENOTRECOVERABLE 131

#define ERFKILL 132

#define EHWPOISON 133