Value of errno: 2Error opening file: No such file or directory
具体有这么多错误类型 ， 真香！
errno 0: Successerrno 1: Operation not permittederrno 2: No such file or directoryerrno 3: No such processerrno 4: Interrupted system callerrno 5: Input/output errorerrno 6: No such device or addresserrno 7: Argument list too longerrno 8: Exec format errorerrno 9: Bad file descriptorerrno 10: No child processeserrno 11: Resource temporarily unavailableerrno 12: Cannot allocate memoryerrno 13: Permission deniederrno 14: Bad addresserrno 15: Block device requirederrno 16: Device or resource busyerrno 17: File existserrno 18: Invalid cross-device linkerrno 19: No such deviceerrno 20: Not a directoryerrno 21: Is a directoryerrno 22: Invalid argumenterrno 23: Too many open files in systemerrno 24: Too many open fileserrno 25: Inappropriate ioctl for deviceerrno 26: Text file busyerrno 27: File too largeerrno 28: No space left on deviceerrno 29: Illegal seekerrno 30: Read-only file systemerrno 31: Too many linkserrno 32: Broken pipeerrno 33: Numerical argument out of domainerrno 34: Numerical result out of rangeerrno 35: Resource deadlock avoidederrno 36: File name too longerrno 37: No locks availableerrno 38: Function not implementederrno 39: Directory not emptyerrno 40: Too many levels of symbolic linkserrno 41: Unknown error 41errno 42: No message of desired typeerrno 43: Identifier removederrno 44: Channel number out of rangeerrno 45: Level 2 not synchronizederrno 46: Level 3 haltederrno 47: Level 3 reseterrno 48: Link number out of rangeerrno 49: Protocol driver not attachederrno 50: No CSI structure availableerrno 51: Level 2 haltederrno 52: Invalid exchangeerrno 53: Invalid request descriptorerrno 54: Exchange fullerrno 55: No anodeerrno 56: Invalid request codeerrno 57: Invalid sloterrno 58: Unknown error 58errno 59: Bad font file formaterrno 60: Device not a streamerrno 61: No data availableerrno 62: Timer expirederrno 63: Out of streams resourceserrno 64: Machine is not on the networkerrno 65: Package not installederrno 66: Object is remoteerrno 67: Link has been severederrno 68: Advertise errorerrno 69: Srmount errorerrno 70: Communication error on senderrno 71: Protocol errorerrno 72: Multihop attemptederrno 73: RFS specific errorerrno 74: Bad messageerrno 75: Value too large for defined data typeerrno 76: Name not unique on networkerrno 77: File descriptor in bad stateerrno 78: Remote address changederrno 79: Can not access a needed shared libraryerrno 80: Accessing a corrupted shared libraryerrno 81: .lib section in a.out corruptederrno 82: Attempting to link in too many shared librarieserrno 83: Cannot exec a shared library directlyerrno 84: Invalid or incomplete multibyte or wide charactererrno 85: Interrupted system call should be restartederrno 86: Streams pipe errorerrno 87: Too many userserrno 88: Socket operation on non-socketerrno 89: Destination address requirederrno 90: Message too longerrno 91: Protocol wrong type for socketerrno 92: Protocol not availableerrno 93: Protocol not supportederrno 94: Socket type not supportederrno 95: Operation not supportederrno 96: Protocol family not supportederrno 97: Address family not supported by protocolerrno 98: Address already in useerrno 99: Cannot assign requested addresserrno 100: Network is downerrno 101: Network is unreachableerrno 102: Network dropped connection on reseterrno 103: Software caused connection aborterrno 104: Connection reset by peererrno 105: No buffer space availableerrno 106: Transport endpoint is already connectederrno 107: Transport endpoint is not connectederrno 108: Cannot send after transport endpoint shutdownerrno 109: Too many references: cannot spliceerrno 110: Connection timed outerrno 111: Connection refusederrno 112: Host is downerrno 113: No route to hosterrno 114: Operation already in progresserrno 115: Operation now in progresserrno 116: Stale file handleerrno 117: Structure needs cleaningerrno 118: Not a XENIX named type fileerrno 119: No XENIX semaphores availableerrno 120: Is a named type fileerrno 121: Remote I/O errorerrno 122: Disk quota exceedederrno 123: No medium founderrno 124: Wrong medium typeerrno 125: Operation cancelederrno 126: Required key not availableerrno 127: Key has expirederrno 128: Key has been revokederrno 129: Key was rejected by serviceerrno 130: Owner diederrno 131: State not recoverableerrno 132: Operation not possible due to RF-kill