Change "NULL pointer: to "NUL " or null pointer".
POSIX uses the term "null pointer", not "NULL pointer".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Linux AF_INET supports SOCK_SEQPACKET via SCTP.
Reported-by: Dongsheng Song <dongsheng.song@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The original list of registers was created by confusing strace
source code--this is for parsing legacy 32-bit code (which is
dead and no one cares). Update the list to reflect native ia64
syscall interface.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The manpage did not mention RB_POWER_OFF which is the glibc
symbolic name for LINUX_REBOOT_CMD_POWER_OFF.
$ cd /usr/include
$ cat x86_64-linux-gnu/sys/reboot.h | grep POWER_OFF
define RB_POWER_OFF 0x4321fedc
Signed-off-by: Elie De Brauwer <eliedebrauwer@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Clarify the perf_event_open behavior with respect to the disabled
bit and creating event groups.
Reported-by: Sudhanshu Goswami <Sudhanshu.Goswami@emc.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Warn that using the perf_event_open "exclusive" bit, while it might seem
like a good idea, might lead to all 0 results in some common usage cases.
Reported-by: Sudhanshu Goswami <Sudhanshu.Goswami@emc.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Here's an updated version of [David Ahern's] patch that
expands the "mmap" definition as well as that of "mmap_data".
Also some manpage related formatting improvements from the
original patch.
Link: https://lkml.org/lkml/2013/11/11/505
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This patch attempts to clarify the pid and cpu options to
perf_event_open().
It does two things:
1. Tries to make clear that the "pid" argument can mean
process *or* thread. This is made confusing by
how Linux uses the terms mostly interchangeably.
2. The cpu/pid documentation was confusing because of
how the parameters are interdependent. Since there
are only 6 possible combinations I broke out the
possibilities into a table.
Reported-by: Manuel Selva <selva.manuel@gmail.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
events==0 does not mean that revents is always returned as
zero. The "output only" events (POLLHUP, POLLERR, POLLNVAL)
can still be returned.
See https://bugzilla.kernel.org/show_bug.cgi?id=61911
Reported-by: Paolo Bonzini <bonzini@gnu.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
See https://bugzilla.kernel.org/show_bug.cgi?id=42705
Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reported-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
It turns out that the perf_event mmap page rdpmc/time setting was
broken, dating back to the introduction of the feature. Due
to a mistake with a bitfield, two different values mapped to
the same feature bit.
A new somewhat backwards compatible interface was introduced
in Linux 3.12. A much longer report on the issue can be found
here:
https://lwn.net/Articles/567894/
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
A new perf_event related ioctl, PERF_EVENT_IOC_ID, was added
in Linux 3.12.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Michael Kerrisk