I create a file using the code below:

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

int main()
{
    const char* filename = "./test.out";
    int fd;
    if(-1 == (fd = open(filename, O_CREAT|O_RDWR, 0666)))
    {
        perror("Error");
        errno = 0;
    }       
    else
        puts("File opened");

    if(-1 == (close(fd)))
    {
        perror("Error");
        errno = 0;
    }
    else
        puts("File closed");

    return 0;
}

I specify the mode argument as 0666, which should grant read,write access to everyone. However, an ls -l shows

-rw-r--r-- 1 kmehta users 0 2012-01-29 16:29 test.out

As you can see, write permissions are only granted to the owner of the file. I do not know why everyone else is not granted permissions correctly. chmod a+w test.out sets the permissions correctly though.

Code compiled as gcc -Wall test.c

Specs: gcc v 4.5.0 on Opensuse 11.3 64 bit

c posix
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