errno

C variable for any error codes that have occured.

Can be annoying with threads when app is not compiled with -D_REENTRANT.

This is typically set by a system call or libc function. For whatever reason, the crooked Windows API doesn't use this, and instead uses GetLastError() and SetLastError(), adding 2 functions when all you need is a variable.

pseudometanode for all possible errno values on Unix (in this case, for a recent FreeBSD; numbers may not be the same, but these should mostly exist on all systems). Small note: these aren't autonoded at all, as I'm doing my own writeups for each and research for ones I'm not totally sure about.

1. EPERM Operation not permitted
2. ENOENT No such file or directory
3. ESRCH No such process
4. EINTR Interrupted system call
5. EIO Input/output error
6. ENXIO Device not configured
7. E2BIG Argument list too long
8. ENOEXEC Exec format error
9. EBADF Bad file descriptor
10. ECHILD No child processes
11. EDEADLK Resource deadlock avoided
12. ENOMEM Cannot allocate memory
13. EACCES Permission denied
14. EFAULT Bad address
15. ENOTBLK Block device required
16. EBUSY Device busy
17. EEXIST File exists
18. EXDEV Cross-device link
19. ENODEV Operation not supported by device
20. ENOTDIR Not a directory
21. EISDIR Is a directory
22. EINVAL Invalid argument
23. ENFILE Too many open files in system
24. EMFILE Too many open files
25. ENOTTY Inappropriate ioctl for device
26. ETXTBSY Text file busy
27. EFBIG File too large
28. ENOSPC No space left on device
29. ESPIPE Illegal seek
30. EROFS Read-only file system
31. EMLINK Too many links
32. EPIPE Broken pipe
33. EDOM Numerical argument out of domain
34. ERANGE Result too large
35. EAGAIN (EWOULDBLOCK) Resource temporarily unavailable
36. EINPROGRESS Operation now in progress
37. EALREADY Operation already in progress
38. ENOTSOCK Socket operation on non-socket
39. EDESTADDRREQ Destination address required
40. EMSGSIZE Message too long
41. EPROTOTYPE Protocol wrong type for socket
42. ENOPROTOOPT Protocol not available
43. EPROTONOSUPPORT Protocol not supported
44. ESOCKTNOSUPPORT Socket type not supported
45. EOPNOTSUPP (ENOTSUP) Operation not supported
46. EPFNOSUPPORT Protocol family not supported
47. EAFNOSUPPORT Address family not supported by protocol family
48. EADDRINUSE Address already in use
49. EADDRNOTAVAIL Can't assign requested address
50. ENETDOWN Network is down
51. ENETUNREACH Network is unreachable
52. ENETRESET Network dropped connection on reset
53. ECONNABORTED Software caused connection abort
54. ECONNRESET Connection reset by peer
55. ENOBUFS No buffer space available
56. EISCONN Socket is already connected
57. ENOTCONN Socket is not connected
58. ESHUTDOWN Can't send after socket shutdown
59. ETOOMANYREFS Too many references: can't splice
60. ETIMEDOUT Operation timed out
61. ECONNREFUSED Connection refused
62. ELOOP Too many levels of symbolic links
63. ENAMETOOLONG File name too long
64. EHOSTDOWN Host is down
65. EHOSTUNREACH No route to host
66. ENOTEMPTY Directory not empty
67. EPROCLIM Too many processes
68. EUSERS Too many users
69. EDQUOT Disc quota exceeded
70. ESTALE Stale NFS file handle
71. EREMOTE Too many levels of remote in path
72. EBADRPC RPC struct is bad
73. ERPCMISMATCH RPC version wrong
74. EPROGUNAVAIL RPC prog. not avail
75. EPROGMISMATCH Program version wrong
76. EPROCUNAVAIL Bad procedure for program
77. ENOLCK No locks available
78. ENOSYS Function not implemented
79. EFTYPE Inappropriate file type or format
80. EAUTH Authentication error
81. ENEEDAUTH Need authenticator
82. EIDRM Identifier removed
83. ENOMSG No message of desired type
84. EOVERFLOW Value too large to be stored in data type
85. ECANCELED Operation canceled
86. EILSEQ Illegal byte sequence