04-09-2009
Quote:
Also how does connect detect that a socket is in use i.e., EADDRINUSE
It gets this error message from bind() because the socket cannot bind to the specified
port bcause the port is already in use or in the FIN-WAIT/CLOSE-WAIT state.
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LEARN ABOUT LINUX
bindresvport
BINDRESVPORT(3) Linux Programmer's Manual BINDRESVPORT(3)
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 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.
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 3.27 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/.
2008-12-03 BINDRESVPORT(3)