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Can multiple connections use the same port?
Multiple connections on the same server can share the same server-side IP/Port pair as long as they are associated with different client-side IP/Port pairs, and the server would be able to handle as many clients as available system resources allow it to.
Can a given socket be associated with more than one TCP connection?
@user2268997: You cannot use a single socket to connect to multiple servers. You must create a separate socket for each connection. @FernandoGonzalezSanchez: A single client can have multiple TCP sockets bound to the same local IP/Port pair as long as they are connected to different remote IP/Port pairs.
What pieces of information make up a socket?
A socket consists of five things: {protocol, local address, local port, remote address, remote port}.
How many sockets can be opened at once?
For most socket interfaces, the maximum number of sockets allowed per each connection between an application and the TCP/IP sockets interface is 65535.
Can two sockets listen to the same port?
Multiple UDP sockets all bound to the same port can all co-exist provided either the same condition as at (1) or they have all had the SO_REUSEADDR option set before binding. TCP ports and UDP ports occupy different namespaces, so the use of a port for TCP does not preclude its use for UDP, and vice versa.
How to check the type of file in fstat?
S_IFLNK can be returned either by lstat () or by fstatat () when the AT_SYMLINK_NOFOLLOW flag is set. To check the type of a file, compare st_mode & S_IFMT against the appropriate S_IF* macro value, or use the S_IS* convenience macros defined in stat.h (3HEAD) .
When is the Fildes argument unused in fstat?
If path is absolute, the fildes argument is unused. If the fildes argument has the special value AT_FDCWD, relative paths are resolved from the current working directory. If AT_SYMLINK_NOFOLLOW is set in the flag argument, the function behaves like lstat () and does not automatically follow symbolic links.
How is lstat function similar to stat function?
The lstat () function obtains file attributes similar to stat (), except when the named file is a symbolic link; in that case lstat () returns information about the link, while stat () returns information about the file the link references.