open() and mode

[Ivan Dobrianov <id11 at cornell dot edu>]

This may have a rather obvious answer, but I can't figure it:

Does anyone know why the following code creates a file with read/write
permissions, instead of only read permissions?
-----------------------------
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>

int main(int argc, char* argv[])
{
   int openflag = (O_BINARY | O_CREAT | O_EXCL | O_WRONLY);
   mode_t mode = 0x124;

   int fd = open ("delme.txt", openflag, mode);

   printf("fd = %d\n", fd);
   mode_t mask = umask(0);
   umask(mask);
   printf("umask = %d\n", mask);
}
-----------------------------
... then .. ls -l delme.txt gives:

-rw-r--r--   1 administ None            0 Sep 25 14:40 delme.txt

My umask is 0. I can chmod on the file to anything I want.

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