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sockfd_lookup(9) [centos man page]

SOCKFD_LOOKUP(9)						 Linux Networking						  SOCKFD_LOOKUP(9)

NAME
sockfd_lookup - Go from a file number to its socket slot SYNOPSIS
struct socket * sockfd_lookup(int fd, int * err); ARGUMENTS
fd file handle err pointer to an error code return DESCRIPTION
The file handle passed in is locked and the socket it is bound too is returned. If an error occurs the err pointer is overwritten with a negative errno code and NULL is returned. The function checks for both invalid handles and passing a handle which is not a socket. On a success the socket object pointer is returned. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SOCKFD_LOOKUP(9)

Check Out this Related Man Page

SOCKET_LAST_ERROR(3)							 1						      SOCKET_LAST_ERROR(3)

socket_last_error - Returns the last error on the socket

SYNOPSIS
int socket_last_error ([resource $socket]) DESCRIPTION
If a socket resource is passed to this function, the last error which occurred on this particular socket is returned. If the socket resource is omitted, the error code of the last failed socket function is returned. The latter is particularly helpful for functions like socket_create(3) which don't return a socket on failure and socket_select(3) which can fail for reasons not directly tied to a particular socket. The error code is suitable to be fed to socket_strerror(3) which returns a string describing the given error code. PARAMETERS
o $socket - A valid socket resource created with socket_create(3). RETURN VALUES
This function returns a socket error code. EXAMPLES
Example #1 socket_last_error(3) example <?php $socket = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket === false) { $errorcode = socket_last_error(); $errormsg = socket_strerror($errorcode); die("Couldn't create socket: [$errorcode] $errormsg"); } ?> NOTES
Note socket_last_error(3) does not clear the error code, use socket_clear_error(3) for this purpose. PHP Documentation Group SOCKET_LAST_ERROR(3)
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