End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class method
Process::UID.switch
Process::UID.switch → integer
Process::UID.switch {|| block} → object
process.c
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static VALUE
p_uid_switch(VALUE obj)
{
rb_uid_t uid, euid;
check_uid_switch();
uid = getuid();
euid = geteuid();
if (uid != euid) {
proc_seteuid(uid);
if (rb_block_given_p()) {
under_uid_switch = 1;
return rb_ensure(rb_yield, Qnil, p_uid_sw_ensure, SAVED_USER_ID);
}
else {
return UIDT2NUM(euid);
}
}
else if (euid != SAVED_USER_ID) {
proc_seteuid(SAVED_USER_ID);
if (rb_block_given_p()) {
under_uid_switch = 1;
return rb_ensure(rb_yield, Qnil, p_uid_sw_ensure, euid);
}
else {
return UIDT2NUM(uid);
}
}
else {
rb_syserr_fail(EPERM, 0);
}
UNREACHABLE_RETURN(Qnil);
}
Switch the effective and real user IDs of the current process. If a block is given, the user IDs will be switched back after the block is executed. Returns the new effective user ID if called without a block, and the return value of the block if one is given.