GETPEEREID(2) BSD Programmer's Manual GETPEEREID(2)
getpeereid - get effective user and group identification of locally- connected peer
#include <sys/types.h> #include <sys/socket.h> int getpeereid(int s, uid_t *euid, gid_t *egid);
getpeereid() returns the effective user ID and group ID of the peer con- nected to a UNIX domain socket (see unix(4)). The argument s must be of type SOCK_STREAM. One common use is for UNIX domain servers to determine the credentials of clients that have connected to it. getpeereid() takes three parameters: • s contains the file descriptor of the socket whose peer credentials should be looked up. • euid points to a uid_t variable into which the effective user ID for the connected peer will be stored. • egid points to a gid_t variable into which the effective group ID for the connected peer will be stored.
If the call succeeds, a 0 is returned and euid and egid are set to the effective user ID and group ID of the connected peer. Otherwise, errno is set and a value of -1 is returned.
On failure, errno is set to one of the following: [EBADF] The argument s is not a valid descriptor. [ENOTSOCK] The argument s is a file, not a socket. [EOPNOTSUPP] The socket is not in the UNIX domain. [ENOTCONN] The socket is not connected. [ENOBUFS] Insufficient resources were available in the system to per- form the operation. [EFAULT] The euid or egid parameters point to memory not in a valid part of the process address space.
accept(2), bind(2), getpeername(2), getsockname(2), socket(2), unix(4)
The getpeereid() function call appeared in OpenBSD 3.0. MirOS BSD #10-current June 26, 2001 1
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