GNU/Linux man pages
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GNU/Linux |
Debian 6.0.0(Squeeze) |
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bindresvport(3) |
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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. However, in this case, bindresvport() has no way to return the port number actually allocated. (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 following errors may occur:
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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.
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 3.27 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/.
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bindresvport(3) | |