User:Johannbg/QA/Systemd/Sd is fifo

Name
sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix — Check the type of a file descriptor

Synopsis
int sd_is_fifo(	int fd, 	const char *path); int sd_is_socket(	int fd, 	int family, 	int type, 	int listening); int sd_is_socket_inet(	int fd, 	int family, 	int type, 	int listening, 	uint16_t port); int sd_is_socket_unix(	int fd, 	int type, 	int listening, 	const char* path, 	size_t length);
 * 1) include "sd-daemon.h"

Description
sd_is_fifo may be called to check whether the specified file descriptor refers to a FIFO or pipe. If the path parameter is not NULL, it is checked whether the FIFO is bound to the specified file system path.

sd_is_socket may be called to check whether the specified file descriptor refers to a socket. It the family parameter is not AF_UNSPEC it is checked whether the socket is of the specified family (AF_UNIX, AF_INET, ...). If the type parameter is not 0 it is checked whether the socket is of the specified type (SOCK_STREAM, SOCK_DGRAM, ...). If the listening parameter is positive it is checked whether the socket is in accepting mode, i.e. listen has been called for it. If listening is 0, it is checked whether the socket is not in this mode. If the parameter is negative, no such check is made. The listening parameter should only be used for stream sockets and should be set to a negative value otherwise.

sd_is_socket_inet is similar to sd_is_socket, but optionally checks the IPv4 or IPv6 port number the socket is bound to, unless port is zero. For this call family must be passed as either AF_UNSPEC, AF_INET or AF_INET6.

sd_is_socket_unix is similar to sd_is_socket, but optionally checks the AF_UNIX path the socket is bound to, unless the path parameter is NULL. For normal file system AF_UNIX sockets set the length parameter to 0. For Linux abstract namespace sockets set the length to the size of the address, including the initial 0 byte and set path to the initial 0 byte of the socket address.

Return Value
On failure, these calls return a negative errno-style error code. If the file descriptor is of the specified type and bound to the specified address a positive return value is returned, otherwise zero.