setresuid(2)

NAME

setresuid, setresgid − set real, effective, and saved user and group IDs

SYNOPSIS

#include <unistd.h>

int setresuid(uid_t ruid, uid_t euid, uid_t suid);

int setresgid(gid_t rgid, gid_t egid, gid_t sgid);

DESCRIPTION

setresuid() sets the real, effective and/or saved user ID of the calling process.

If the current real, effective or saved user ID is equal to that of a user with having appropriate privileges, setresuid() sets the real, effective and saved user IDs to ruid, euid, and suid, respectively. Otherwise, setresuid() only sets the real, effective, and saved user IDs if ruid, euid, and suid each match at least one of the current real, effective, or saved user IDs.

If ruid, euid, or suid is −1, setresuid() leaves the current real, effective or saved user ID unchanged.

setresgid() sets the real, effective and/or saved group ID of the calling process.

If the current real, effective or saved user ID is equal to that of a user having appropriate privileges, setresgid() sets the real, effective, and saved group IDs to rgid, egid, and sgid, respectively. Otherwise, setresgid() only sets the real, effective and saved group IDs if rgid, egid, and sgid each match at least one of the current real, effective or saved group IDs.

If rgid, egid, or sgid is −1, setresgid() leaves the current real, effective or saved group ID unchanged.

RETURN VALUE

Upon successful completion, setresuid() and setresgid() return 0; otherwise, they return −1 and set errno to indicate the error.

ERRORS

setresuid() and setresgid() fail if any of the following conditions are encountered:

[EINVAL] ruid, euid, or suid (rgid, egid, or sgid) is not a valid user (group) ID.

[EPERM] None of the conditions above are met.

AUTHOR

setresuid() and setresgid() were developed by HP.

Museum

Related Articles