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System Calls setuid(2)
NAME
setuid, setegid, seteuid, setgid - set user and group IDs
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int setuid(uid_t uid);
int setgid(gid_t gid);
int seteuid(uid_t euid);
int setegid(gid_t egid);
DESCRIPTION
The setuid() function sets the real user ID, effective user
ID, and saved user ID of the calling process. The setgid()
function sets the real group ID, effective group ID, and
saved group ID of the calling process. The setegid() and
seteuid() functions set the effective group and user IDs
respectively for the calling process. See intro(2) for more
information on real, effective, and saved user and group
IDs.
At login time, the real user ID, effective user ID, and
saved user ID of the login process are set to the login ID
of the user responsible for the creation of the process. The
same is true for the real, effective, and saved group IDs;
they are set to the group ID of the user responsible for the
creation of the process.
When a process calls one of the exec(2) family of functions
to execute a file (program), the user and/or group identif-
iers associated with the process can change. If the file
executed is a set-user-ID file, the effective and saved user
IDs of the process are set to the owner of the file exe-
cuted. If the file executed is a set-group-ID file, the
effective and saved group IDs of the process are set to the
group of the file executed. If the file executed is not a
set-user-ID or set-group-ID file, the effective user ID,
saved user ID, effective group ID, and saved group ID are
not changed.
If the {PRIV_PROC_SETID} privilege is asserted in the effec-
tive set of the process calling setuid(), the real, effec-
tive, and saved user IDs are set to the uid argument. If
the uid argument is 0 and none of the saved, effective or
real UID is 0, additional restrictions apply. See
privileges(5).
SunOS 5.10 Last change: 20 Jan 2003 1
System Calls setuid(2)
If the {PRIV_PROC_SETID} privilege is not asserted in the
effective set, but uid is either the real user ID or the
saved user ID of the calling process, the effective user ID
is set to uid.
If the {PRIV_PROC_SETID} privilege is asserted in the effec-
tive set of the process calling setgid(), the real, effec-
tive, and saved group IDs are set to the gid argument.
If the {PRIV_PROC_SETID} privilege is not asserted in the
effective set, but gid is either the real group ID or the
saved group ID of the calling process, the effective group
ID is set to gid.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
ERRORS
The setuid() and setgid() functions will fail if:
EINVAL The value of uid or gid is out of range.
EPERM For setuid() and seteuid(), the
{PRIV_PROC_SETID} privilege is not asserted
in the effective set of the calling process
and the uid argument does not match either
the real or saved user IDs, or an attempt is
made to change to UID 0 and none of the
existing UIDs is 0, in which case additional
privileges are required.
For setgid() and setegid(), the
{PRIV_PROC_SETID} privilege is not asserted
in the effective set and the gid argument
does not match either the real or saved
group IDs.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 20 Jan 2003 2
System Calls setuid(2)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
| MT-Level | Async-Signal-Safe |
|_____________________________|_____________________________|
SEE ALSO
intro(2), exec(2), getgroups(2), getuid(2), stat.h(3HEAD),
attributes(5), privileges(5), standards(5)
SunOS 5.10 Last change: 20 Jan 2003 3
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 11:27:09 GMT 2007
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