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BINDRESVPORT(3) Linux Programmer's Manual BINDRESVPORT(3) NAME bindresvport - bind a socket to a privileged IP port SYNOPSIS #include <sys/types.h> #include <netinet/in.h> int bindresvport(int sd, struct sockaddr_in **sin); DESCRIPTION bindresvport() is used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023. If in->sin_port is 0 then an anonymous port in the range 600 to 1023 be chosen. If the bind(2) performed by bindresvport() is successful, then sin->sin_port returns the port number actually allocated. sin can be NULL, in which case sin->sin_family is implicitly taken to be AF_INET, and an anonymous port is allocated (as above). However, in this case, bindresvport() has no way to return the port number actually allocated. RETURN VALUE bindresvport() returns 0 if it is successful, otherwise -1 is returned and errno set to indicate the cause of the error. ERRORS bindresvport() can fail for any of the same reasons as bind(2). CONFORMING TO Not in POSIX.1-2001. Present on the BSDs, Solaris, and many other sys- tems. NOTES Only root can bind to a privileged port; this call will fail for any other users. In addition, the following error may occur: EPFNOSUPPORT sin is not NULL and sin->sin_family is not AF_INET. SEE ALSO bind(2) 2007-05-31 BINDRESVPORT(3)