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getpeername(2) [freebsd man page]

GETPEERNAME(2)						      BSD System Calls Manual						    GETPEERNAME(2)

NAME
getpeername -- get name of connected peer LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <sys/socket.h> int getpeername(int s, struct sockaddr * restrict name, socklen_t * restrict namelen); DESCRIPTION
The getpeername() system call returns the name of the peer connected to socket s. The namelen argument should be initialized to indicate the amount of space pointed to by name. On return it contains the actual size of the name returned (in bytes). The name is truncated if the buffer provided is too small. RETURN VALUES
The getpeername() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The call succeeds unless: [EBADF] The argument s is not a valid descriptor. [ECONNRESET] The connection has been reset by the peer. [EINVAL] The value of the namelen argument is not valid. [ENOTSOCK] The argument s is a file, not a socket. [ENOTCONN] The socket is not connected. [ENOBUFS] Insufficient resources were available in the system to perform the operation. [EFAULT] The name argument points to memory not in a valid part of the process address space. SEE ALSO
accept(2), bind(2), getsockname(2), socket(2) HISTORY
The getpeername() system call appeared in 4.2BSD. BSD
June 4, 1993 BSD

Check Out this Related Man Page

GETPEERNAME(2)						     Linux Programmer's Manual						    GETPEERNAME(2)

NAME
getpeername - get name of connected peer socket SYNOPSIS
#include <sys/socket.h> int getpeername(int s, struct sockaddr *name, socklen_t *namelen); DESCRIPTION
Getpeername returns the name of the peer connected to socket s. The namelen parameter should be initialized to indicate the amount of space pointed to by name. On return it contains the actual size of the name returned (in bytes). The name is truncated if the buffer pro- vided is too small. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EBADF The argument s is not a valid descriptor. ENOTSOCK The argument s is a file, not a socket. ENOTCONN The socket is not connected. ENOBUFS Insufficient resources were available in the system to perform the operation. EFAULT The name parameter points to memory not in a valid part of the process address space. CONFORMING TO
SVr4, 4.4BSD (the getpeername function call first appeared in 4.2BSD). NOTE
The third argument of getpeername is in reality an `int *' (and this is what BSD 4.* and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t. The draft standard has not been adopted yet, but glibc2 already follows it and also has socklen_t. See also accept(2). SEE ALSO
accept(2), bind(2), getsockname(2) BSD Man Page 1993-07-30 GETPEERNAME(2)

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