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Date:	Sun, 12 Mar 2023 17:44:43 +1100
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Subject:	3.4.6-1 shm_open always returns -1, errno EINVAL
To:	cygwin AT cygwin DOT com
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From:	Matthew Rickard via Cygwin <cygwin AT cygwin DOT com>
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X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 32C6joGk021265

Hi all,

Cygwin 3.4.6-1 shm_open seems to reject all calls, returning  the value 
-1 and setting errno to 22 EINVAL.

For example, this program:

#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>

int main() {
   int res = shm_open("123", O_CREAT | O_RDWR, 0666);
   int error = errno;
   printf("res=%d errno=%d\n", res, errno);
   if (error == EINVAL)
     printf("That's EINVAL\n");
   return 0;
}

Says:

$ gcc -Og -o tiny tiny.c; ./tiny
res=-1 errno=22
That's EINVAL

Not sure if relevant, but I am currently running cygserver, with a 
default config.



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