There is no difference between umask 0022 and umask 022. The octal umasks are calculated via the bitwise AND of the unary complement of the argument using bitwise NOT. Set the umask like this: el@apollo:~$ umask 0077 el@apollo:~$ umask 0077 el@apollo:~$ umask 0022 el@apollo:~$ umask 0022 Brief summary of umask value meanings: umask 077 – … Read more
Another solution is to create a directory with the desired permissions, and then create the socket inside it (example code without any regard for error checking and buffer overflows): // Create a directory with the proper permissions mkdir(path, 0700); // Append the name of the socket strcat(path, “/socket_name”); // Create the socket normally sockaddr_un address; … Read more
You can attach gdb to a running process and then call umask in the debugger: (gdb) attach <your pid> … (gdb) call umask(0) [Switching to Thread -1217489200 (LWP 11037)] $1 = 18 # this is the umask (gdb) call umask(18) # reset umask $2 = 0 (gdb) (note: 18 corresponds to a umask of O22 … Read more
Both Debian and Ubuntu ship with pam_umask. This allows you to configure umask in /etc/login.defs and have them apply system-wide, regardless of how a user logs in. To enable it, you may need to add a line to /etc/pam.d/common-session reading session optional pam_umask.so or it may already be enabled. Then edit /etc/login.defs and change the … Read more
To get the right ownership, you can set the group setuid bit on the directory with chmod g+rwxs dirname This will ensure that files created in the directory are owned by the group. You should then make sure everyone runs with umask 002 or 007 or something of that nature—this is why Debian and many … Read more