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
/* Operation not permitted */
#define ENOENT
2 /* No such file or directory */
#define ESRCH 3 /* No such process */
#define EINTR 4 /* Interrupted system call */
#define EIO 5 /* I/O error */
#define ENXIO 6 /* No such device or address */
#define E2BIG 7 /* Argument list too long */
#define ENOEXEC
8 /* Exec format error */
#define EBADF 9 /* Bad file number */
#define ECHILD
10 /* No child processes */
#define EAGAIN
11 /* Try again */
#define ENOMEM
12 /* Out of memory */
#define EACCES
13 /* Permission denied */
#define EFAULT
14 /* Bad address */
#define ENOTBLK
15 /* Block device required */
#define EBUSY 16 /* Device or resource busy */
#define EEXIST
17 /* File exists */
#define EXDEV 18 /* Cross-device link */
#define ENODEV
19 /* No such device */
#define ENOTDIR
20 /* Not a directory */
#define EISDIR
21 /* Is a directory */
#define EINVAL
22 /* Invalid argument */
#define ENFILE
23 /* File table overflow */
#define EMFILE
24 /* Too many open files */
#define ENOTTY
25 /* Not a typewriter */
#define ETXTBSY
26 /* Text file busy */
#define EFBIG 27 /* File too large */
#define ENOSPC
28 /* No space left on device */
#define ESPIPE
29 /* Illegal seek */
#define EROFS 30 /* Read-only file system */
#define EMLINK
31 /* Too many links */
#define EPIPE 32 /* Broken pipe */
#define EDOM 33 /* Math argument out of domain of func */
#define ERANGE
34 /* Math result not representable */
#define
EDEADLK 35
/* Resource deadlock would occur */
#define ENAMETOOLONG
36 /* File name too long */
#define ENOLCK
37 /* No record locks available */
#define ENOSYS
38 /* Function not implemented */
#define ENOTEMPTY
39 /* Directory not empty */
#define ELOOP 40 /* Too many symbolic links encountered */
#define EWOULDBLOCK
EAGAIN /* Operation would block */
#define ENOMSG
42 /* No message of desired type */
#define EIDRM 43 /* Identifier removed */
#define ECHRNG
44 /* Channel number out of range */
#define EL2NSYNC
45 /* Level 2 not synchronized */
#define EL3HLT
46 /* Level 3 halted */
#define EL3RST
47 /* Level 3 reset */
#define ELNRNG
48 /* Link number out of range */
#define EUNATCH
49 /* Protocol driver not attached */
#define ENOCSI
50 /* No CSI structure available */
#define EL2HLT
51 /* Level 2 halted */
#define EBADE 52 /* Invalid exchange */
#define EBADR 53 /* Invalid request descriptor */
#define EXFULL
54 /* Exchange full */
#define ENOANO
55 /* No anode */
#define EBADRQC
56 /* Invalid request code */
#define EBADSLT
57 /* Invalid slot */
#define EDEADLOCK
EDEADLK
#define EBFONT
59 /* Bad font file format */
#define ENOSTR
60 /* Device not a stream */
#define ENODATA
61 /* No data available */
#define ETIME 62 /* Timer expired */
#define ENOSR 63 /* Out of streams resources */
#define ENONET
64 /* Machine is not on the network */
#define ENOPKG
65 /* Package not installed */
#define EREMOTE
66 /* Object is remote */
#define ENOLINK
67 /* Link has been severed */
#define EADV 68 /* Advertise error */
#define ESRMNT
69 /* Srmount error */
#define ECOMM 70 /* Communication error on send */
#define EPROTO
71 /* Protocol error */
#define EMULTIHOP
72 /* Multihop attempted */
#define EDOTDOT
73 /* RFS specific error */
#define EBADMSG
74 /* Not a data message */
#define EOVERFLOW
75 /* Value too large for defined data type */
#define ENOTUNIQ
76 /* Name not unique on network */
#define EBADFD
77 /* File descriptor in bad state */
#define EREMCHG
78 /* Remote address changed */
#define ELIBACC
79 /* Can not access a needed shared library */
#define ELIBBAD
80 /* Accessing a corrupted shared library */
#define ELIBSCN
81 /* .lib section in a.out corrupted */
#define ELIBMAX
82 /* Attempting to link in too many shared libraries */
#define ELIBEXEC
83 /* Cannot exec a shared library directly */
#define EILSEQ
84 /* Illegal byte sequence */
#define ERESTART
85 /* Interrupted system call should be restarted */
#define ESTRPIPE
86 /* Streams pipe error */
#define EUSERS
87 /* Too many users */
#define ENOTSOCK
88 /* Socket operation on non-socket */
#define EDESTADDRREQ
89 /* Destination address required */
#define EMSGSIZE
90 /* Message too long */
#define EPROTOTYPE
91 /* Protocol wrong type for socket */
#define ENOPROTOOPT
92 /* Protocol not available */
#define EPROTONOSUPPORT
93 /* Protocol not supported */
#define ESOCKTNOSUPPORT
94 /* Socket type not supported */
#define EOPNOTSUPP
95 /* Operation not supported on transport endpoint */
#define EPFNOSUPPORT
96 /* Protocol family not supported */
#define EAFNOSUPPORT
97 /* Address family not supported by protocol */
#define EADDRINUSE
98 /* Address already in use */
#define EADDRNOTAVAIL
99 /* Cannot assign requested address */
#define ENETDOWN
100 /* Network is down */
#define ENETUNREACH
101 /* Network is unreachable */
#define ENETRESET
102 /* Network dropped connection because of reset */
#define ECONNABORTED
103 /* Software caused connection abort */
#define ECONNRESET
104 /* Connection reset by peer */
#define ENOBUFS
105 /* No buffer space available */
#define EISCONN
106 /* Transport endpoint is already connected */
#define ENOTCONN
107 /* Transport endpoint is not connected */
#define ESHUTDOWN
108 /* Cannot send after transport endpoint shutdown */
#define ETOOMANYREFS
109 /* Too many references: cannot splice */
#define ETIMEDOUT
110 /* Connection timed out */
#define ECONNREFUSED
111 /* Connection refused */
#define EHOSTDOWN
112 /* Host is down */
#define EHOSTUNREACH
113 /* No route to host */
#define EALREADY
114 /* Operation already in progress */
#define EINPROGRESS
115 /* Operation now in progress */
#define ESTALE
116 /* Stale NFS file handle */
#define EUCLEAN
117 /* Structure needs cleaning */
#define ENOTNAM
118 /* Not a XENIX named type file */
#define ENAVAIL
119 /* No XENIX semaphores available */
#define EISNAM
120 /* Is a named type file */
#define EREMOTEIO
121 /* Remote I/O error */
#define EDQUOT
122 /* Quota exceeded */
#define ENOMEDIUM
123 /* No medium found */
#define EMEDIUMTYPE
124 /* Wrong medium type */
#define ECANCELED
125 /* Operation Canceled */
#define ENOKEY
126 /* Required key not available */
#define EKEYEXPIRED
127 /* Key has expired */
#define EKEYREVOKED
128 /* Key has been revoked */
#define EKEYREJECTED
129 /* Key was rejected by service */
/* for robust mutexes */
#define EOWNERDEAD
130 /* Owner died */
#define ENOTRECOVERABLE
131 /* State not recoverable */
#define ERFKILL 132
/* Operation not possible due to RF-kill */
#define EHWPOISON 133
/* Memory page has hardware error */
Linux错误号（errno）对应错误一览：http://www.linuxdiyf.com/linux/7981.html
Linux下错误的捕获：errno和strerror的使用：http://www.linuxdiyf.com/linux/5840.html