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getpriority.2: NOTES: add "C library/kernel ABI differences" subheading 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-05-16 08:27:22 +02:00
parent 95591ecace
commit 0ebe771f91
1 changed files with 13 additions and 12 deletions
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@ -198,6 +198,19 @@ Linux before 1.3.36 had \-infinity..15.
Since kernel 1.3.43, Linux has the range \-20..19. Since kernel 1.3.43, Linux has the range \-20..19.
On some other systems, the range of nice values is \-20..20. On some other systems, the range of nice values is \-20..20.
Including
.I <sys/time.h>
is not required these days, but increases portability.
(Indeed,
.I <sys/resource.h>
defines the
.I rusage
structure with fields of type
.I struct timeval
defined in
.IR <sys/time.h> .)
.\"
.SS C library/kernel ABI differences
Within the kernel, nice values are actually represented Within the kernel, nice values are actually represented
using the corresponding range 40..1 using the corresponding range 40..1
(since negative numbers are error codes) and these are the values (since negative numbers are error codes) and these are the values
@ -210,18 +223,6 @@ The glibc wrapper functions for these system calls handle the
translations between the user-land and kernel representations translations between the user-land and kernel representations
of the nice value according to the formula of the nice value according to the formula
.IR "unice\ =\ 20\ \-\ knice" . .IR "unice\ =\ 20\ \-\ knice" .
.LP
Including
.I <sys/time.h>
is not required these days, but increases portability.
(Indeed,
.I <sys/resource.h>
defines the
.I rusage
structure with fields of type
.I struct timeval
defined in
.IR <sys/time.h> .)
.SH BUGS .SH BUGS
According to POSIX, the nice value is a per-process setting. According to POSIX, the nice value is a per-process setting.
However, under the current Linux/NPTL implementation of POSIX threads, However, under the current Linux/NPTL implementation of POSIX threads,