进程退出码解析
在linux中進程退出之后會有一個退出狀態，可以通過$echo $?進行查看。
如果說把進程比作一個人（病人和正常人）的話那么進程退出碼就可以看做是病人的癥狀！
挺好用的如果你發現執行某個命令或自己編寫的代碼生成的ELF文件發現毛都沒發生過就可以通過該指令進行查看。
那么不同的退查狀態又說明進程發生了什么了呢？可以通過perror進行查看！下面是通過通過perror指令查看得到的所有的退出碼的解析(en)。
OS error code?? 0:? Success
OS error code?? 1:? Operation not permitted
OS error code?? 2:? No such file or directory
OS error code?? 3:? No such process
OS error code?? 4:? Interrupted system call
OS error code?? 5:? Input/output error
OS error code?? 6:? No such device or address
OS error code?? 7:? Argument list too long
OS error code?? 8:? Exec format error
OS error code?? 9:? Bad file descriptor
OS error code? 10:? No child processes
OS error code? 11:? Resource temporarily unavailable
OS error code? 12:? Cannot allocate memory
OS error code? 13:? Permission denied
OS error code? 14:? Bad address
OS error code? 15:? Block device required
OS error code? 16:? Device or resource busy
OS error code? 17:? File exists
OS error code? 18:? Invalid cross-device link
OS error code? 19:? No such device
OS error code? 20:? Not a directory
OS error code? 21:? Is a directory
OS error code? 22:? Invalid argument
OS error code? 23:? Too many open files in system
OS error code? 24:? Too many open files
OS error code? 25:? Inappropriate ioctl for device
OS error code? 26:? Text file busy
OS error code? 27:? File too large
OS error code? 28:? No space left on device
OS error code? 29:? Illegal seek
OS error code? 30:? Read-only file system
OS error code? 31:? Too many links
OS error code? 32:? Broken pipe
OS error code? 33:? Numerical argument out of domain
OS error code? 34:? Numerical result out of range
OS error code? 35:? Resource deadlock avoided
OS error code? 36:? File name too long
OS error code? 37:? No locks available
OS error code? 38:? Function not implemented
OS error code? 39:? Directory not empty
OS error code? 40:? Too many levels of symbolic links
Illegal error code: 41
OS error code? 42:? No message of desired type
OS error code? 43:? Identifier removed
OS error code? 44:? Channel number out of range
OS error code? 45:? Level 2 not synchronized
OS error code? 46:? Level 3 halted
OS error code? 47:? Level 3 reset
OS error code? 48:? Link number out of range
OS error code? 49:? Protocol driver not attached
OS error code? 50:? No CSI structure available
OS error code? 51:? Level 2 halted
OS error code? 52:? Invalid exchange
OS error code? 53:? Invalid request descriptor
OS error code? 54:? Exchange full
OS error code? 55:? No anode
OS error code? 56:? Invalid request code
OS error code? 57:? Invalid slot
Illegal error code: 58
OS error code? 59:? Bad font file format
OS error code? 60:? Device not a stream
OS error code? 61:? No data available
OS error code? 62:? Timer expired
OS error code? 63:? Out of streams resources
OS error code? 64:? Machine is not on the network
OS error code? 65:? Package not installed
OS error code? 66:? Object is remote
OS error code? 67:? Link has been severed
OS error code? 68:? Advertise error
OS error code? 69:? Srmount error
OS error code? 70:? Communication error on send
OS error code? 71:? Protocol error
OS error code? 72:? Multihop attempted
OS error code? 73:? RFS specific error
OS error code? 74:? Bad message
OS error code? 75:? Value too large for defined data type
OS error code? 76:? Name not unique on network
OS error code? 77:? File descriptor in bad state
OS error code? 78:? Remote address changed
OS error code? 79:? Can not access a needed shared library
OS error code? 80:? Accessing a corrupted shared library
OS error code? 81:? .lib section in a.out corrupted
OS error code? 82:? Attempting to link in too many shared libraries
OS error code? 83:? Cannot exec a shared library directly
OS error code? 84:? Invalid or incomplete multibyte or wide character
OS error code? 85:? Interrupted system call should be restarted
OS error code? 86:? Streams pipe error
OS error code? 87:? Too many users
OS error code? 88:? Socket operation on non-socket
OS error code? 89:? Destination address required
OS error code? 90:? Message too long
OS error code? 91:? Protocol wrong type for socket
OS error code? 92:? Protocol not available
OS error code? 93:? Protocol not supported
OS error code? 94:? Socket type not supported
OS error code? 95:? Operation not supported
OS error code? 96:? Protocol family not supported
OS error code? 97:? Address family not supported by protocol
OS error code? 98:? Address already in use
OS error code? 99:? Cannot assign requested address
OS error code 100:? Network is down
OS error code 101:? Network is unreachable
OS error code 102:? Network dropped connection on reset
OS error code 103:? Software caused connection abort
OS error code 104:? Connection reset by peer
OS error code 105:? No buffer space available
OS error code 106:? Transport endpoint is already connected
OS error code 107:? Transport endpoint is not connected
OS error code 108:? Cannot send after transport endpoint shutdown
OS error code 109:? Too many references: cannot splice
OS error code 110:? Connection timed out
OS error code 111:? Connection refused
OS error code 112:? Host is down
OS error code 113:? No route to host
OS error code 114:? Operation already in progress
OS error code 115:? Operation now in progress
OS error code 116:? Stale NFS file handle
OS error code 117:? Structure needs cleaning
OS error code 118:? Not a XENIX named type file
OS error code 119:? No XENIX semaphores available
OS error code 120:? Is a named type file
MySQL error code 120: Didn't find key on read or update
OS error code 121:? Remote I/O error
MySQL error code 121: Duplicate key on write or update
OS error code 122:? Disk quota exceeded
MySQL error code 122: Internal (unspecified) error in handler
OS error code 123:? No medium found
MySQL error code 123: Someone has changed the row since it was read (while the table was locked to prevent it)
OS error code 124:? Wrong medium type
MySQL error code 124: Wrong index given to function
OS error code 125:? Operation canceled
MySQL error code 125: Undefined handler error 125
OS error code 126:? Required key not available
MySQL error code 126: Index file is crashed
OS error code 127:? Key has expired
MySQL error code 127: Record file is crashed
OS error code 128:? Key has been revoked
MySQL error code 128: Out of memory in engine
OS error code 129:? Key was rejected by service
MySQL error code 129: Undefined handler error 129
OS error code 130:? Owner died
MySQL error code 130: Incorrect file format
OS error code 131:? State not recoverable
MySQL error code 131: Command not supported by database
OS error code 132:? Operation not possible due to RF-kill
MySQL error code 132: Old database file
MySQL error code 133: No record read before update
MySQL error code 134: Record was already deleted (or record file crashed)
MySQL error code 135: No more room in record file
MySQL error code 136: No more room in index file
MySQL error code 137: No more records (read after end of file)
MySQL error code 138: Unsupported extension used for table
MySQL error code 139: Too big row
MySQL error code 140: Wrong create options
MySQL error code 141: Duplicate unique key or constraint on write or update
MySQL error code 142: Unknown character set used in table
MySQL error code 143: Conflicting table definitions in sub-tables of MERGE table
MySQL error code 144: Table is crashed and last repair failed
MySQL error code 145: Table was marked as crashed and should be repaired
MySQL error code 146: Lock timed out; Retry transaction
MySQL error code 147: Lock table is full;? Restart program with a larger locktable
MySQL error code 148: Updates are not allowed under a read only transactions
MySQL error code 149: Lock deadlock; Retry transaction
MySQL error code 150: Foreign key constraint is incorrectly formed
MySQL error code 151: Cannot add a child row
MySQL error code 152: Cannot delete a parent row
MySQL error code 153: No savepoint with that name
MySQL error code 154: Non unique key block size
MySQL error code 155: The table does not exist in engine
MySQL error code 156: The table already existed in storage engine
MySQL error code 157: Could not connect to storage engine
MySQL error code 158: Unexpected null pointer found when using spatial index
MySQL error code 159: The table changed in storage engine
MySQL error code 160: There's no partition in table for the given value
MySQL error code 161: Row-based binlogging of row failed
MySQL error code 162: Index needed in foreign key constraint
MySQL error code 163: Upholding foreign key constraints would lead to a duplicate key error in some other table
MySQL error code 164: Table needs to be upgraded before it can be used
MySQL error code 165: Table is read only
MySQL error code 166: Failed to get next auto increment value
MySQL error code 167: Failed to set row auto increment value
MySQL error code 168: Unknown (generic) error from engine
MySQL error code 169: Record is the same
MySQL error code 170: It is not possible to log this statement
MySQL error code 171: The event was corrupt, leading to illegal data being read
MySQL error code 172: The table is of a new format not supported by this version
MySQL error code 173: The event could not be processed no other hanlder error happened
MySQL error code 174: Got a fatal error during initialzaction of handler
MySQL error code 175: File to short; Expected more data in file
MySQL error code 176: Read page with wrong checksum
MySQL error code 177: Too many active concurrent transactions
Illegal error code: 178
Illegal error code: 179
Illegal error code: 180
Illegal error code: 181
Illegal error code: 182
Illegal error code: 183
Illegal error code: 184
Illegal error code: 185
Illegal error code: 186
Illegal error code: 187
Illegal error code: 188
Illegal error code: 189
Illegal error code: 190
Illegal error code: 191
Illegal error code: 192
Illegal error code: 193
Illegal error code: 194
Illegal error code: 195
Illegal error code: 196
Illegal error code: 197
Illegal error code: 198
Illegal error code: 199
Illegal error code: 200
Illegal error code: 201
Illegal error code: 202
Illegal error code: 203
Illegal error code: 204
Illegal error code: 205
Illegal error code: 206
Illegal error code: 207
Illegal error code: 208
Illegal error code: 209
Illegal error code: 210
Illegal error code: 211
Illegal error code: 212
Illegal error code: 213
Illegal error code: 214
Illegal error code: 215
Illegal error code: 216
Illegal error code: 217
Illegal error code: 218
Illegal error code: 219
Illegal error code: 220
Illegal error code: 221
Illegal error code: 222
Illegal error code: 223
Illegal error code: 224
Illegal error code: 225
Illegal error code: 226
Illegal error code: 227
Illegal error code: 228
Illegal error code: 229
Illegal error code: 230
Illegal error code: 231
Illegal error code: 232
Illegal error code: 233
Illegal error code: 234
Illegal error code: 235
Illegal error code: 236
Illegal error code: 237
Illegal error code: 238
Illegal error code: 239
Illegal error code: 240
Illegal error code: 241
Illegal error code: 242
Illegal error code: 243
Illegal error code: 244
Illegal error code: 245
Illegal error code: 246
Illegal error code: 247
Illegal error code: 248
Illegal error code: 249
Illegal error code: 250
Illegal error code: 251
Illegal error code: 252
Illegal error code: 253
Illegal error code: 254
Illegal error code: 255
知道了這些退出碼之后自己寫shell程序的時候就可以選擇適當的退出碼了！
轉載于:https://www.cnblogs.com/dashingman/archive/2012/05/04/2482245.html
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