Проект OpenNet: MAN bindresvport (3) Библиотечные вызовы (FreeBSD и Linux)

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bindresvport (3)

bindresvport (3) ( FreeBSD man: Библиотечные вызовы )

bindresvport (3) ( Русские man: Библиотечные вызовы )

>> bindresvport (3) ( Linux man: Библиотечные вызовы )

NAME

bindresvport - bind a socket to a privileged IP port

SYNOPSIS

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

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

DESCRIPTION

bindresvport() is used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023.

If in->sin_port is 0 then an anonymous port in the range 600 to 1023 be chosen. If the bind(2) performed by bindresvport() is successful, 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, and an anonymous port is allocated (as above). However, in this case, bindresvport() has no way to return the port number actually allocated.

RETURN VALUE

bindresvport() returns 0 if it is successful, 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).

CONFORMING TO

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

NOTES

Only root can bind to a privileged port; this call will fail for any other users. In addition, the following error may occur:

EAFNOSUPPORT (EPFNOSUPPORT in glibc 2.7 and earlier): sin is not NULL and sin->sin_family is not AF_INET.

COLOPHON

This page is part of release 3.14 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/.