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BINDRESVPORT(3) 		    Linux Programmer's Manual			  BINDRESVPORT(3)

       bindresvport - bind a socket to a privileged IP port

       #include <sys/types.h>
       #include <netinet/in.h>

       int bindresvport(int sockfd, struct sockaddr_in *sin);

       bindresvport() 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.

       If the bind(2) performed by bindresvport() is  successful,  and	sin  is  not  NULL,  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.  How-
       ever, in this case, bindresvport() has no way to return the  port  number  actually  allo-
       cated.  (This information can later be obtained using getsockname(2).)

       bindresvport()  returns	0  on success; otherwise -1 is returned and errno set to indicate
       the cause of the error.

       bindresvport() can fail for any of the same reasons as bind(2).	In addition, the  follow-
       ing errors may occur:

       EACCES The  caller  did not have superuser privilege (to be precise: the CAP_NET_BIND_SER-
	      VICE 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  pro-
       tected, so it is not thread-safe.

       Since  glibc  2.17, the bindresvport() function uses a lock to protect static variable, so
       it is thread-safe.

       Not in POSIX.1-2001.  Present on the BSDs, Solaris, and many other systems.

       Unlike some bindresvport() implementations, the glibc  implementation  ignores  any  value
       that the caller supplies in sin->sin_port.

       bind(2), getsockname(2)

       This  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

					    2013-06-21				  BINDRESVPORT(3)
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