|BINDRESVPORT(3)||Linux Programmer's Manual||BINDRESVPORT(3)|
NAMEbindresvport - bind a socket to a privileged IP port
int bindresvport(int sockfd, struct sockaddr_in *sin);
DESCRIPTIONbindresvport() is used to bind a socket descriptor to a privileged anonymous IP port, that is, a port number arbitrarily selected from the range 512 to 1023.
RETURN VALUEbindresvport() returns 0 on success; otherwise -1 is returned and errno set to indicate the cause of the error.
ERRORSbindresvport() can fail for any of the same reasons as bind(2). In addition, the following errors may occur:
- The caller did not have superuser privilege (to be precise: the CAP_NET_BIND_SERVICE capability is required).
- All privileged ports are in use.
- EAFNOSUPPORT ( EPFNOSUPPORT in glibc 2.7 and earlier)
- sin is not NULL and sin->sin_family is not AF_INET.
Multithreading (see pthreads(7))Before glibc 2.17, the bindresvport() function uses a static variable that is not protected, so it is not thread-safe.
CONFORMING TONot in POSIX.1-2001. Present on the BSDs, Solaris, and many other systems.
NOTESUnlike some bindresvport() implementations, the glibc implementation ignores any value that the caller supplies in sin->sin_port.
SEE ALSObind(2), getsockname(2)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.