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Cygwin: nice: align return value and errno with POSIX and Linux

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Return new nice value instead of 0 on success.
Set errno to EPERM instead of EACCES on failure.

Signed-off-by: Christian Franke <christian.franke@t-online.de>
This commit is contained in:
Christian Franke 2024-11-27 18:54:37 +01:00 committed by Corinna Vinschen
parent 9ae51bcc51
commit 6adfb1fc28
2 changed files with 14 additions and 1 deletions
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4
winsup/cygwin/release/3.6.0
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@ -48,3 +48,7 @@ What changed:
or EPERM if Windows would silently set a lower priority
(HIGH_PRIORITY_CLASS instead of REALTIME_PRIORITY_CLASS) due to
missing administrator privileges.
- nice(2) now returns the new nice value instead of 0 on success
and sets errno to EPERM instead of EACCES on failure. This confirms
to POSIX and Linux (glibc >= 2.2.4) behavior.

11
winsup/cygwin/syscalls.cc
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@ -3959,7 +3959,16 @@ out:
extern "C" int
nice (int incr)
{
return setpriority (PRIO_PROCESS, myself->pid, myself->nice + incr);
if (setpriority (PRIO_PROCESS, myself->pid, myself->nice + incr))
{
/* POSIX: EPERM instead of EACCES. */
set_errno (EPERM);
return -1;
}
/* POSIX: return the new nice value. Linux glibc >= 2.2.4 provides
conformance with POSIX (FreeBSD returns 0). */
return myself->nice;
}
static void