getpeerucred(3C)					   Standard C Library Functions 					  getpeerucred(3C)

NAME

       getpeerucred - get connected socket/STREAM peer's credentials

SYNOPSIS

       #include <ucred.h>

       int getpeerucred(int fd, ucred_t **ucred);

DESCRIPTION

       The  getpeerucred() function returns the credentials of the peer endpoint of a connection-oriented socket (SOCK_STREAM) or STREAM fd at the
       time the endpoint was created or the connection was established.  A process that initiates a connection retrieves the  credentials  of  its
       peer  at the time the peer's endpoint was created. A process that listens for connections retrieves the credentials of the peer at the time
       the peer initiated the connection.

       When successful, getpeerucred() stores the pointer to a freshly allocated ucred_t in the memory location pointed to by the  ucred  argument
       if that memory location contains the null pointer. If the memory location is non-null, it will reuse the existing ucred_t.

       When ucred is no longer needed, a credential allocated by getpeerucred() should be freed with ucred_free(3C).

       It is possible that all fields of the ucred_t are not available to for all peer endpoints and all callers.

RETURN VALUES

       Upon successful completion, getpeerucred() returns 0. Otherwise, it returns -1 and errno is set to indicate the error.

ERRORS

       The getpeerucred() function will fail if:

       EAGAIN	       There  is  not  enough  memory available to allocate sufficient memory to hold the user credential. The application can try
		       again later.

       EBADF	       The fd argument is not a valid file descriptor.

       EFAULT	       The pointer location pointed to by the ucred_t ** argument points to an invalid, non-null address.

       EINVAL	       The socket is connected but the peer credentials are unknown.

       ENOMEM	       The physical limits of the system are exceeded by the memory allocation needed to hold the user credential.

       ENOTCONN        The socket or STREAM is not connected or the STREAM's peer is unknown.

       ENOTSUP	       This operation is not supported on this file descriptor.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       door_ucred(3DOOR), ucred_get(3C), attributes(5), connld(7M)

NOTES

       The system currently supports both sides of connection endpoints for local AF_UNIX, AF_INET, and AF_INET6 sockets,  /dev/tcp,  /dev/ticots,
       and  /dev/ticotsord  XTI/TLI  connections,  and	pipe file descriptors sent using I_SENDFD as a result of the open of a named pipe with the
       "connld" module pushed.

SunOS 5.10							    26 May 2004 						  getpeerucred(3C)