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    Command:

    bindresvport

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <netinet/in.h>
    
           int bindresvport(int sockfd, struct sockaddr_in *sin);
    
    
    

    DESCRIPTION

           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  allo-
           cated.
    
           sin  can  be NULL, in which case sin->sin_family is implicitly taken to
           be AF_INET.  However, in this case, bindresvport() has no way to return
           the  port  number  actually  allocated.  (This information can later be
           obtained using getsockname(2).)
    
    
    

    RETURN VALUE

           bindresvport() returns 0 on success; 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).  In
           addition, the following errors may occur:
    
           EACCES The caller did not have superuser privilege (to be precise:  the
                  CAP_NET_BIND_SERVICE capability is required).
    
           EADDRINUSE
                  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.
    
    
    

    ATTRIBUTES

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

    CONFORMING TO

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

    NOTES

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