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x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_PID_GET_OWNER_UID(3)      sd_pid_get_owner_uid      SD_PID_GET_OWNER_UID(3)

NAME
       sd_pid_get_owner_uid, sd_pid_get_session, sd_pid_get_user_unit,
       sd_pid_get_unit, sd_pid_get_machine_name, sd_pid_get_slice,
       sd_pid_get_user_slice, sd_pid_get_cgroup, sd_pidfd_get_owner_uid,
       sd_pidfd_get_session, sd_pidfd_get_user_unit, sd_pidfd_get_unit,
       sd_pidfd_get_machine_name, sd_pidfd_get_slice, sd_pidfd_get_user_slice,
       sd_pidfd_get_cgroup, sd_peer_get_owner_uid, sd_peer_get_session,
       sd_peer_get_user_unit, sd_peer_get_unit, sd_peer_get_machine_name,
       sd_peer_get_slice, sd_peer_get_user_slice, sd_peer_get_cgroup -
       Determine the owner uid of the user unit or session, or the session,
       user unit, system unit, container/VM or slice that a specific PID or
       socket peer belongs to

SYNOPSIS
       #include <systemd/sd-login.h>

       int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);

       int sd_pid_get_session(pid_t pid, char **session);

       int sd_pid_get_user_unit(pid_t pid, char **unit);

       int sd_pid_get_unit(pid_t pid, char **unit);

       int sd_pid_get_machine_name(pid_t pid, char **name);

       int sd_pid_get_slice(pid_t pid, char **slice);

       int sd_pid_get_user_slice(pid_t pid, char **slice);

       int sd_pid_get_cgroup(pid_t pid, char **cgroup);

       int sd_pidfd_get_owner_uid(int pidfd, uid_t *uid);

       int sd_pidfd_get_session(int pidfd, char **session);

       int sd_pidfd_get_user_unit(int pidfd, char **unit);

       int sd_pidfd_get_unit(int pidfd, char **unit);

       int sd_pidfd_get_machine_name(int pidfd, char **name);

       int sd_pidfd_get_slice(int pidfd, char **slice);

       int sd_pidfd_get_user_slice(int pidfd, char **slice);

       int sd_pidfd_get_cgroup(int pidfd, char **cgroup);

       int sd_peer_get_owner_uid(int fd, uid_t *uid);

       int sd_peer_get_session(int fd, char **session);

       int sd_peer_get_user_unit(int fd, char **unit);

       int sd_peer_get_unit(int fd, char **unit);

       int sd_peer_get_machine_name(int fd, char **name);

       int sd_peer_get_slice(int fd, char **slice);

       int sd_peer_get_user_slice(int fd, char **slice);

       int sd_peer_get_cgroup(int fd, char **cgroup);

DESCRIPTION
       sd_pid_get_owner_uid() may be used to determine the Unix UID (user
       identifier) which owns the login session or systemd user unit of a
       process identified by the specified PID. For processes which are not
       part of a login session and not managed by a user manager, this
       function will fail with -ENODATA.

       sd_pid_get_session() may be used to determine the login session
       identifier of a process identified by the specified process identifier.
       The session identifier is a short string, suitable for usage in file
       system paths. Please note the login session may be limited to a stub
       process or two. User processes may instead be started from their
       systemd user manager, e.g. GUI applications started using DBus
       activation, as well as service processes which are shared between
       multiple logins of the same user. For processes which are not part of a
       login session, this function will fail with -ENODATA. The returned
       string needs to be freed with the libc free(3) call after use.

       sd_pid_get_user_unit() may be used to determine the systemd user unit
       (i.e. user service or scope unit) identifier of a process identified by
       the specified PID. The unit name is a short string, suitable for usage
       in file system paths. For processes which are not managed by a user
       manager, this function will fail with -ENODATA. The returned string
       needs to be freed with the libc free(3) call after use.

       sd_pid_get_unit() may be used to determine the systemd system unit
       (i.e. system service or scope unit) identifier of a process identified
       by the specified PID. The unit name is a short string, suitable for
       usage in file system paths. Note that not all processes are part of a
       system unit/service. For processes not being part of a systemd system
       unit, this function will fail with -ENODATA. (More specifically, this
       call will not work for kernel threads.) The returned string needs to be
       freed with the libc free(3) call after use.

       sd_pid_get_machine_name() may be used to determine the name of the VM
       or container is a member of. The machine name is a short string,
       suitable for usage in file system paths. The returned string needs to
       be freed with the libc free(3) call after use. For processes not part
       of a VM or container, this function fails with -ENODATA.

       sd_pid_get_slice() may be used to determine the slice unit the process
       is a member of. See systemd.slice(5) for details about slices. The
       returned string needs to be freed with the libc free(3) call after use.

       Similarly, sd_pid_get_user_slice() returns the user slice (as managed
       by the user's systemd instance) of a process.

       sd_pid_get_cgroup() returns the control group path of the specified
       process, relative to the root of the hierarchy. Returns the path
       without trailing slash, except for processes located in the root
       control group, where "/" is returned. To find the actual control group
       path in the file system, the returned path needs to be prefixed with
       /sys/fs/cgroup/ (if the unified control group setup is used), or
       /sys/fs/cgroup/HIERARCHY/ (if the legacy multi-hierarchy control group
       setup is used).

       If the pid parameter of any of these functions is passed as 0, the
       operation is executed for the calling process.

       The sd_pidfd_get_owner_uid(), sd_pidfd_get_session(),
       sd_pidfd_get_user_unit(), sd_pidfd_get_unit(),
       sd_pidfd_get_machine_name(), sd_pidfd_get_slice(),
       sd_pidfd_get_user_slice() and sd_pidfd_get_cgroup() calls operate
       similarly to their PID counterparts, but accept a PIDFD instead of a
       PID, which means they are not subject to recycle race conditions as the
       process is pinned by the file descriptor during the whole duration of
       the invocation. Note that these require a kernel that supports PIDFD. A
       suitable file descriptor may be acquired via pidfd_open(2).

       The sd_peer_get_owner_uid(), sd_peer_get_session(),
       sd_peer_get_user_unit(), sd_peer_get_unit(),
       sd_peer_get_machine_name(), sd_peer_get_slice(),
       sd_peer_get_user_slice() and sd_peer_get_cgroup() calls operate
       similarly to their PID counterparts, but accept a connected AF_UNIX
       socket and retrieve information about the connected peer process. Note
       that these fields are retrieved via /proc/, and hence are not suitable
       for authorization purposes, as they are subject to races.

RETURN VALUE
       On success, these calls return 0 or a positive integer. On failure,
       these calls return a negative errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -ESRCH
           The specified PID does not refer to a running process.

       -EBADF
           The specified socket file descriptor was invalid.

       -ENODATA
           The given field is not specified for the described process or peer.

       -EINVAL
           An input parameter was invalid (out of range, or NULL, where that
           is not accepted).

       -ENOMEM
           Memory allocation failed.

NOTES
       Functions described here are available as a shared library, which can
       be compiled against and linked to with the libsystemd pkg-config(1)
       file.

       Note that the login session identifier as returned by
       sd_pid_get_session() is completely unrelated to the process session
       identifier as returned by getsid(2).

SEE ALSO
       systemd(1), sd-login(3), sd_session_is_active(3), getsid(2),
       systemd.slice(5), systemd-machined.service(8)

systemd 254                                            SD_PID_GET_OWNER_UID(3)

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