[PATCH v2] procfs: expose umask in /proc/<PID>/status

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



v1 -> v2:

 - Change printf format to %#04o.

 - Retest and update examples accordingly.

----------

It's not possible to read the process umask without also modifying it,
which is what umask(2) does.  A library cannot read umask safely,
especially if the main program might be multithreaded.

Add a new status line ("Umask") in /proc/<PID>/status.  It contains
the file mode creation mask (umask) in octal.  It is only shown for
tasks which have task->fs.

For the library this allows me to read the umask from
/proc/self/status.

This patch is adapted from one originally written by Pierre Carrier:
https://lkml.org/lkml/2012/5/4/451

Example usage:

$ grep Umask /proc/1/status 
Umask:	0022
$ grep Umask /proc/2/status 
Umask:	0022
$ grep Umask /proc/self/status 
Umask:	0022
$ umask 002
$ grep Umask /proc/self/status 
Umask:	0002

Rich.

--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux