Error codes returned by Errno() function:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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