setregid.2 (2010 09)

setregid(2) setregid(2)

NAME

setregid - sets the real and effective group IDs

SYNOPSIS

#include <unistd.h>

int setregid(gid_t

rgid, gid_t egid);

DESCRIPTION

setregid() sets the real and effective group IDs of the calling process.

Only a privileged process can set the real group ID and/or the effective group ID to any valid value. A

nonprivileged process can set the real group ID to the saved set-group-ID from one of the exec family of

functions, or the effective group ID to either the saved set-group-ID or the real group ID.

Any supplementary group IDs of the calling process remain unchanged.

Argument rgid is the read group ID value to be set with. If rgid is set to

-1, the real group ID is not be

changed.

Argument egid is the effective group ID value to be set with. If egid is set to -1, the effective group ID is

not changed.

The real and effective group IDs may be set to different values in the same call.

Security Restrictions

Some or all of the actions associated with this system call require the

PRIV_CHSUBJIDENT

privilege

(CHSUBJIDENT). Processes owned by the superuser will have this privilege. Processes owned by other

users may have this privilege, depending on system conﬁguration.

See privileges (5) for more information about privileged access on systems that support ﬁne-grained

privileges.

RETURN VALUE

Upon successful completion

errno is set to 0. Otherwise, errno is set to indicate the type of error and

neither group IDs are changed.

ERRORS

errno is set to one of the following values if the corresponding condition is detected.

[EINVAL] The value of the rgid or egid argument is invalid or out-of-range.

[EPERM] The process does NOT have all the appropriate privileges other than to change the real

group ID to the saved set-group-ID, or to change the effective group ID to either the real

group ID or the saved set-group-ID.

AUTHOR

setregid() was developed by the University of California, Berkeley and HP.