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rresvport(3) Library Functions Manual rresvport(3) NAME rresvport - Retrieves a socket with a privileged address LIBRARY Standard C Library (libc.a) SYNOPSIS int rresvport ( int *port ); PARAMETERS Specifies the port to use for the connection. DESCRIPTION The rresvport() function obtains a socket with a privileged address bound to the socket. A privileged Internet port is one that falls in the range of 0 to 1023. Only processes with an effective user ID of root can use the rresv- port() function. An authentication scheme based on remote port numbers is used to verify permissions. If the connection succeeds, a socket in the Internet domain of type SOCK_STREAM is returned to the calling process. RETURN VALUES Upon successful completion, the rresvport() function returns a valid, bound socket descriptor. Otherwise, a value of -1 is returned and er- rno is set to indicate the error. ERRORS If the rresvport() function fails, errno may be set to one of the fol- lowing values: All network ports are in use. The addresses in the specified address family cannot be used with this socket. Two hundred (200) file descriptors are currently open. The system file table is full. Insufficient buffers are available in the system to complete the function. FILES Contains the service names. RELATED INFORMATION Functions: rcmd(3), ruserok(3) delim off rresvport(3)