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Set real and effect user IDs
#include <unistd.h>
int setreuid( uit_t ruid,
uid_t euid );
- ruid
- The real user ID that you want to use for the process, or -1 if you
don't want to change it.
- euid
- The effective user ID that you want to use for the process, or -1 if
you don't want to change it.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The setreuid() function sets the real and effective user
IDs of the calling process. If ruid or euid
is -1, the corresponding real or effective user ID isn't
changed.
If the effective user ID of the calling process is the superuser, you
can set the real user ID and the effective user ID to any legal value.
If the effective user ID of the calling process isn't the superuser,
you can set either the real user ID to the effective user ID, or the
effective user ID to the saved set-user ID or the real user ID.
|
If a set-UID process sets its effective user ID to its real user ID,
it can still set its effective user ID back to the saved set-UID. |
In either case, if you're changing the real user ID (i.e. ruid is
not -1), or you're changing the effective user ID to a value
that isn't equal to the real user ID, the saved set-user ID is set equal to the
new effective user ID.
The “superuser” is defined as any process with an effective
user ID of 0, or an effective user ID of root.
Zero on success, or -1 if an error occurs
(errno is set).
- EINVAL
- The ruid or euid is out of range.
- EPERM
- The calling process isn't the superuser, and you tried
to change the effective user ID to a value other than the
real or saved set-user ID.
Or
The calling process isn't the superuser, and you tried
to change the real user ID to a value other than the effective
user ID.
POSIX 1003.1 XSI
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
execve(),
getuid(),
setregid(),
setuid()
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