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hurd: handle EINTR during critical sections

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During critical sections, signal handling is deferred and thus RPCs return
EINTR, even if SA_RESTART is set. We thus have to restart the whole critical
section in that case.

This also adds HURD_CRITICAL_UNLOCK in the cases where one wants to
break the section in the middle.
This commit is contained in:
Samuel Thibault
2021-03-23 22:38:54 +00:00
parent a4ea18ec6c
commit c3b287be74
29 changed files with 139 additions and 4 deletions
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4
sysdeps/mach/hurd/setgroups.c
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@@ -34,6 +34,7 @@ setgroups (size_t n, const gid_t *groups)
for (i = 0; i < n; ++i)
new[i] = groups[i];
retry:
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_id.lock);
err = _hurd_check_ids ();
@@ -50,6 +51,9 @@ setgroups (size_t n, const gid_t *groups)
}
__mutex_unlock (&_hurd_id.lock);
HURD_CRITICAL_END;
if (err == EINTR)
/* Got a signal while inside an RPC of the critical section, retry again */
goto retry;
if (err)
return __hurd_fail (err);