/***
Set the uid, euid, gid, egid, sid or pid & gid.
@function setpid
@string what one of 'u', 'U', 'g', 'G', 's', 'p' (upper-case means "effective")
@int id (uid, gid or pid for every value of `what` except 's')
@int[opt] gid (only for `what` value 'p')
@treturn[1] int `0`, if successful
@return[2] nil
@treturn[2] string error message
@treturn[2] int errnum
@see setuid(2)
@see seteuid(2)
@see setgid(2)
@see setegid(2)
@see setsid(2)
@see setpgid(2)
*/
static int
Psetpid(lua_State *L)
{
const char *what=luaL_checkstring(L, 1);
checknargs(L, *what == 'p' ? 3 : 2);
switch (*what)
{
case 'U':
return pushresult(L, seteuid(mygetuid(L, 2)), NULL);
case 'u':
return pushresult(L, setuid(mygetuid(L, 2)), NULL);
case 'G':
return pushresult(L, setegid(mygetgid(L, 2)), NULL);
case 'g':
return pushresult(L, setgid(mygetgid(L, 2)), NULL);
case 's':
return pushresult(L, setsid(), NULL);
case 'p':
{
pid_t pid = checkint(L, 2);
pid_t pgid = checkint(L, 3);
return pushresult(L, setpgid(pid,pgid), NULL);
}
default:
badoption(L, 1, "id", *what);
return 0;
}
}
static int Pchown(lua_State *L) /** chown(path,uid,gid) */
{
const char *path = luaL_checkstring(L, 1);
uid_t uid = mygetuid(L, 2);
gid_t gid = mygetgid(L, 3);
return pushresult(L, chown(path, uid, gid), path);
}
static int Psetgid(lua_State *L) /** setgid(name or id) */
{
return pushresult(L, setgid(mygetgid(L, 1)), NULL);
}