On 04/13/16 12:05, Richard W.M. Jones wrote:
v3 -> v4:
- Rename the syscall: getumask becomes umask2.
- Add flags parameter, with one flag (UMASK_GET_MASK).
- Expand the rationale for this change in the first commit message.
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.
I wouldn't say "if"; that is the case when it matters.
I have to say I'm skeptic to the need for umask2() as opposed to
getumask(). I would also like to be able to get the umask of another
process, which would argue for adding it to /proc anyway.
-hpa
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