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You are here: manpages





BINDRESVPORT

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index Return to Main Contents
 

NAME

bindresvport - bind a socket to a privileged IP port  

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 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).)  

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

For an explanation of the terms used in this section, see attributes(7).
T}Thread safety glibc >= 2.17: MT-Safe
glibc < 2.17: MT-Unsafe

The bindresvport() function uses a static variable that was not protected by a lock before glibc 2.17, rendering the function MT-Unsafe.  

CONFORMING TO

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

NOTES

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

SEE ALSO

bind(2), getsockname(2)  

COLOPHON

This page is part of release 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO
COLOPHON


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