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| author | Paul Eggert <eggert@cs.ucla.edu> | 2022-01-14 17:27:51 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2022-01-14 17:32:43 -0800 |
| commit | 0ac98783691bbf8212537ebe18ddb68feb22a760 (patch) | |
| tree | e5482d6aa1edeaf14be664c4e1386f116d905e59 /doc/glibc-functions | |
| parent | 1a4a0680c84b5a726c8b38c22aa68a049865fa31 (diff) | |
| download | gnulib-0ac98783691bbf8212537ebe18ddb68feb22a760.tar.gz | |
copy-file-range: work around Linux kernel bug
This workaround is adapted from Coreutils.
* lib/copy-file-range.c [__linux__ && HAVE_COPY_FILE_RANGE]:
Include <sys/utsname.h>.
(copy_file_range): Use a stub to replace the copy_file_range of
Linux kernel versions 4.5 through 5.2.
* lib/unistd.in.h (copy_file_range):
* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS):
* modules/copy-file-range (configure.ac):
* modules/unistd (unistd.h):
Support replacement of copy_file_range.
* m4/copy-file-range.m4 (gl_FUNC_COPY_FILE_RANGE):
Define HAVE_COPY_FILE_RANGE if the system has copy_file_range,
and on Linux check whether the system’s is known to work.
Diffstat (limited to 'doc/glibc-functions')
| -rw-r--r-- | doc/glibc-functions/copy_file_range.texi | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/glibc-functions/copy_file_range.texi b/doc/glibc-functions/copy_file_range.texi index baac6e1302..f10271c157 100644 --- a/doc/glibc-functions/copy_file_range.texi +++ b/doc/glibc-functions/copy_file_range.texi @@ -24,6 +24,11 @@ This function exists only on Linux and FreeBSD and is therefore missing on many non-glibc platforms: glibc 2.26, macOS 11.1, FreeBSD 12.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 7.1, HP-UX 11.31, IRIX 6.5, Solaris 11.4, Cygwin 2.9, mingw, MSVC 14, Android 9.0. But the replacement function is only a stub: It always fails with error ENOSYS. + +@item +This function has many problems on Linux kernel versions before 5.3. +On these kernel versions, the replacement function always fails with +error ENOSYS. @end itemize Portability problems not fixed by Gnulib: |