8ba4036bba
This man page was referenced from some places. This is mostly a condensed version of the POSIX behavior that the system call implementation already has, only documenting the obviously visible errors (in source code) we do actually report.
1.5 KiB
Name
accept - accept a new connection on a server socket
Synopsis
#include <sys/socket.h>
int accept(int sockfd, sockaddr* addr, socklen_t* addrlen);
Description
Accept a new connection from a client for the server specified by sockfd. This function will block until there is at least one client trying to connect to the server, with other clients being queued up for accepting.
When accept(2) is successful, a new socket with a unique file descriptor is created and that file descriptor returned. If not null, the addr argument will contain the address of the newly-connected client. If not null, the addrlen argument will contain the maximum length of the client address that should be written, and it will in turn be overwritten with the actual length of the client address written back to addr.
Return value
If the return value is positive, it represents the file descriptor of the new socket connected to the client that was accepted. If the return value is -1, the error can be found in errno, where the most important errors are:
EBADFD: The file descriptorsockfdis invalid.ENOTSOCK: The given file descriptorsockfdis valid, but does not point to a socket.EMFILE: No more file descriptors are available for the new socket.EAGAIN: The socket was specified to be non-blocking, and there is no client in the queue. The user should try toaccept(2)again at a later point.EINTR: A signal interrupted the blocking.