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linux: Provide PTRACE_GET_THREAD_AREA for 32-bit x86 with glibc

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glibc’s own <sys/ptrace.h> should provide this but doesn’t. See
https://sourceware.org/bugzilla/show_bug.cgi?id=22433.

The copy in compat provided it when targeting x86-64 and using glibc.
util/linux/ptracer.cc uses it when targeting both 32-bit x86 and x86-64,
so the compat definition must be made to apply to 32-bit x86 too.

This also provides a #define using the same name as the constant, which
is what glibc’s <sys/ptrace.h> does for other constants.

Bug: crashpad:30
Change-Id: I5a0734a236d1c25398fb69e66f58dfe118658b68
Reviewed-on: https://chromium-review.googlesource.com/765257
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Mark Mentovai 2017-11-13 17:03:32 -05:00 committed by Commit Bot
parent b8f61fdc8b
commit 22e8c33b21
1 changed files with 5 additions and 2 deletions
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7
compat/linux/sys/ptrace.h
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@ -19,9 +19,12 @@
#include <sys/cdefs.h>
#if defined(__GLIBC__) && defined(__x86_64__)
// https://sourceware.org/bugzilla/show_bug.cgi?id=22433
#if !defined(PTRACE_GET_THREAD_AREA) && \
defined(__GLIBC__) && (defined(__i386__) || defined(__x86_64__))
static constexpr __ptrace_request PTRACE_GET_THREAD_AREA =
static_cast<__ptrace_request>(25);
#endif // __GLIBC__ && __x86_64__
#define PTRACE_GET_THREAD_AREA PTRACE_GET_THREAD_AREA
#endif // !PTRACE_GET_THREAD_AREA && __GLIBC__ && (__i386__ || __x86_64__)
#endif // CRASHPAD_COMPAT_LINUX_SYS_PTRACE_H_