Compile warning with glibc 2.25:
warning: In the GNU C Library, "makedev" is defined by
<sys/sysmacros.h>. For historical compatibility, it is
currently defined by <sys/types.h> as well, but we plan to
remove this soon. To use "makedev", include <sys/sysmacros.h>
directly. If you did not intend to use a system-defined macro
"makedev", you should undefine it after including
<sys/types.h>.
Background: glibc commit dbab6577c6684c62bd2521c1c29dc25c3cac966f
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
As hinted in the kernel source, MAX_HANDLE_SZ is a hint
rather than a promise:
/* limit the handle size to NFSv4 handle size now */
#define MAX_HANDLE_SZ 128
Note the "now" (probably should be "for now").
So change the description to make this clear.
Reported-by: Lennart Poettering <lennart@poettering.net>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Recast the advice against manually declaring 'errno' to
a more modern perspective. It's 13 years since the original
text was added, and even then it was describing old behavior.
Cast the description to be about behavior further away in
time, and note more clearly that manual declaration will
cause problems with modern C libraries.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Added after a patch from Wesley Aptekar-Cassels that proposed
to add error numbers to the text.
Reported-by: Wesley Aptekar-Cassels <w.aptekar@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
POSIX.1-2008 noted the explicitly the change (to align with
the C standards) that error numbers are positive, rather
than nonzero.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Restructure the text and add some subheadings for better
readability. No (intentional) content changes.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Based on comparing the filtered content of the two main
kernel errno files:
cat include/uapi/asm-generic/errno.h \
include/uapi/asm-generic/errno-base.h | grep define | \
grep -v 'define _' | awk '{print $2}' | sort -u
to see what is absent from this page, and used in either kernel
or glibc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The recent addition of NFS re-export and the possibility of using
name_to_handle_at() on an NFS filesystem raises issues with
name_to_handle_at() which have not been properly documented.
Getting the file handle for an untriggered automount point is
arguably meaningless and in certainly not supported by NFS.
name_to_handle_at() will return -EOVERFLOW even though the
requested "handle_bytes" is large enough. This is an unfortunate
overloading of the error code, but is manageable.
So clarify this and also note that the mount_id is returned when
EOVERFLOW is reported.
Thought: it would be nice if mount_id were returned in the
EOPNOTSUPP case too. I guess it is too late to fix that (?).
Link: https://github.com/systemd/systemd/issues/7082
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Document the glibc 2.24 change that dropped CWD from the default
search path employed by execlp(), execvp() and execvpe() when
PATH is not defined.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Michael Kerrisk