Admittedly, the POSIX specification for exit() also uses octal.
However, 0xFF immediately indicates the lowest 8 bits to me
whereas I had to think a bit about the octal mask.
Cowritten-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This was already shown in an earlier version of the page,
but Adam Borowski's patch replaced it with an alternative.
Probably, it is better to show both possibilities.
Reported-by: "Joseph C. Sible" <josephcsible@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
In the example snippet, we already have the fd, thus there's no
need to refer to the file by name. And, /proc/ might be not
mounted or not accessible.
Noticed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
PTRACE_EVENT_STOP does not always report SIGTRAP, can be the
signal which stopped us
While at it, fix an obvious copy/paste error in
PTRACE_GET_SYSCALL_INFO description.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Somewhat surprisingly, perf_event_open() can fail with EINTR when
trying to enable perf reporting for a uprobe that's already been
configured for use with ftrace. Mention this error in the man
page.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The man page contains a trivial bug that's discussed here:
https://stackoverflow.com/q/59628958
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Linux kernel commit e78bbfa82624 ("mm: stop returning -ENOENT from
sys_move_pages() if nothing got migrated") had the effect of
*never* returning -ENOENT, in any situation. So we need to update
the man page to reflect that ENOENT is not a possible return
value.
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Historically (before Linux 2.6.23), base_addr was unsigned long
for 32-bit code and unsigned int for 64-bit code. In other words,
it was always a 32-bit value. When the ldt.h header files were
unified, the type became unsigned int on all systems. Update
modify_ldt.2 and set_thread_area.2 accordingly.
Indeed, on x86, the GDT and LDT specify 32-bit bases for code and
data segments, and this has nothing to do with the kernel.
Reported-by: "Metzger, Markus T" <markus.t.metzger@intel.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The programmer should not need to care about the numeric values,
and their inclusion is verbosity.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Since kernel commit 3dd4d40b4208("xfs: Sanity check flags
of Q_XQUOTARM call"), it has added flags check. If it is
not usr,grp,prj quota type, it will report EINVAL.
Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Added two missing parentheses
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This surely meant to say clone3() and not clone(3).
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Michael Kerrisk