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Linux: Deprecate <sys/sysctl.h> and sysctl
Now that there are no internal users of __sysctl left, it is possible to add an unconditional deprecation warning to <sys/sysctl.h>. To avoid a test failure due this warning in check-install-headers, skip the test for sys/sysctl.h. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2019-06-12 Florian Weimer <fweimer@redhat.com>
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Linux: Deprecate sysctl.
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* include/sysctl.h (__sysctl): Remove declaration.
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* scripts/check-installed-headers.sh (sys/sysctl.h): Disable
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check.
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* sysdeps/unix/sysv/linux/sys/sysctl.h: Add deprecation warning.
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(sysctl): Add deprecation attribute.
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* sysdeps/unix/sysv/linux/sysctl.c: Include <linux/sysctl.h>
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directly, to avoid the deprecation warning. Do not include
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<string.h>.
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(__sysctl): Remove hidden alias.
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2019-06-12 Florian Weimer <fweimer@redhat.com>
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Linux: Use kernel headers for statx definitions if available.
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5
NEWS
5
NEWS
@ -61,6 +61,11 @@ Deprecated and removed features, and other changes affecting compatibility:
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* On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
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header have been removed.
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* The Linux-specific <sys/sysctl.h> header and the sysctl function have been
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deprecated and will be removed from a future version of glibc.
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Application should directly access /proc instead. For obtaining random
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bits, the getentropy function can be used.
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Changes to build and runtime requirements:
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* GCC 6.2 or later is required to build the GNU C Library.
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@ -1,13 +1,3 @@
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#ifndef _SYS_SYSCTL_H
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#include_next <sys/sysctl.h>
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# ifndef _ISOMAC
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/* Read or write system parameters (Linux, FreeBSD specific). */
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extern int __sysctl (int *__name, int __nlen, void *__oldval,
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size_t *__oldlenp, void *__newval, size_t __newlen);
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libc_hidden_proto (__sysctl)
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# endif /* !_ISOMAC */
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#endif /* _SYS_SYSCTL_H */
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@ -53,7 +53,6 @@ trap "rm -f '$cih_test_c'" 0
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failed=0
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is_x86_64=unknown
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is_x32=unknown
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for header in "$@"; do
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# Skip various headers for which this test gets a false failure.
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case "$header" in
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@ -75,27 +74,10 @@ for header in "$@"; do
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(finclude/*)
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continue;;
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# sys/sysctl.h is unsupported for x32.
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# sys/sysctl.h produces a deprecation warning and therefore
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# fails compilation with -Werror.
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(sys/sysctl.h)
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case "$is_x32" in
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(yes) continue;;
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(no) ;;
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(unknown)
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cat >"$cih_test_c" <<EOF
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#if defined __x86_64__ && defined __ILP32__
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# error "is x32"
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#endif
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EOF
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if $cc_cmd -fsyntax-only "$cih_test_c" > /dev/null 2>&1
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then
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is_x32=no
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else
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is_x32=yes
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continue
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fi
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;;
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esac
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;;
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continue;;
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# sys/vm86.h is "unsupported on x86-64" and errors out on that target.
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(sys/vm86.h)
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@ -18,6 +18,8 @@
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#ifndef _SYS_SYSCTL_H
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#define _SYS_SYSCTL_H 1
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#warning "The <sys/sysctl.h> header is deprecated and will be removed."
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#include <features.h>
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#define __need_size_t
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#include <stddef.h>
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@ -66,7 +68,8 @@ __BEGIN_DECLS
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/* Read or write system parameters. */
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extern int sysctl (int *__name, int __nlen, void *__oldval,
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size_t *__oldlenp, void *__newval, size_t __newlen) __THROW;
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size_t *__oldlenp, void *__newval, size_t __newlen) __THROW
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__attribute_deprecated__;
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__END_DECLS
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@ -17,8 +17,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <string.h> /* For the real memset prototype. */
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#include <sys/sysctl.h>
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#include <linux/sysctl.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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@ -39,5 +38,4 @@ __sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
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return INLINE_SYSCALL (_sysctl, 1, &args);
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}
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libc_hidden_def (__sysctl)
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weak_alias (__sysctl, sysctl)
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