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From: Corinna Vinschen <>
Subject: [newlib-cygwin] Cygwin: POSIX mq: only allo priority up to MQ_PRIO_MAX - 1
Date: Thu, 29 Apr 2021 18:14:22 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=4f89f24fbeb5ccfbd7077878a5342bf62f722917

commit 4f89f24fbeb5ccfbd7077878a5342bf62f722917
Author: Corinna Vinschen <>
Date:   Thu Apr 29 20:04:24 2021 +0200

    Cygwin: POSIX mq: only allo priority up to MQ_PRIO_MAX - 1
    POSIX requires that message priorities range from 0 (low) to
    sysconf(_SC_MQ_PRIO_MAX) - 1 (high).  Cygwin's mq_send erroneously
    allowed a message priority of sysconf(_SC_MQ_PRIO_MAX).  Fix it.
    Signed-off-by: Corinna Vinschen <>

 winsup/cygwin/ | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/ b/winsup/cygwin/
index eec9ffe63..c6a003c37 100644
--- a/winsup/cygwin/
+++ b/winsup/cygwin/
@@ -798,7 +798,7 @@ _mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio,
 	  set_errno (EBADF);
-      if (prio > MQ_PRIO_MAX)
+      if (prio >= MQ_PRIO_MAX)
 	  set_errno (EINVAL);

                 reply	other threads:[~2021-04-29 18:14 UTC|newest]

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