66 lines
2.4 KiB
Diff
66 lines
2.4 KiB
Diff
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From d9c4c3b481e641b719d3d790987ed7d094157bf2 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C4=90o=C3=A0n=20Tr=E1=BA=A7n=20C=C3=B4ng=20Danh?=
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<congdanhqx@gmail.com>
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Date: Fri, 12 Feb 2021 19:21:18 +0700
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Subject: [PATCH] profile-handler: use documented sigev_notify_thread_id in
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sigevent
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sigevent(7) is documented to have sigev_notify_thread_id as its member.
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In glibc system, it's a macro expanded to the legacy _sigev_un._tid,
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_sigev_un._tid is obviously an internal implementation detail as
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signaled by its underscore prefix. And this macro was hidden inside
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linux/signal.h in older version of glibc.
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On Linux that use musl libc, sigev_notify_thread_id is also a macro, but
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it's expanded to __sev_fields.sigev_notify_thread_id
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[alkondratenko@gmail.com: amputated broken linux/signal.h dependency]
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[alkondratenko@gmail.com: see https://github.com/gperftools/gperftools/pull/1250]
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Signed-off-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
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---
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src/profile-handler.cc | 17 ++++++++++++++++-
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1 file changed, 16 insertions(+), 1 deletion(-)
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diff --git src/profile-handler.cc src/profile-handler.cc
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index 7fdcb693..fe3715b1 100644
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--- src/profile-handler.cc
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+++ src/profile-handler.cc
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@@ -49,6 +49,9 @@
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#if HAVE_LINUX_SIGEV_THREAD_ID
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// for timer_{create,settime} and associated typedefs & constants
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#include <time.h>
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+// for sigevent
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+#include <signal.h>
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+
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// for sys_gettid
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#include "base/linux_syscall_support.h"
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// for perftools_pthread_key_create
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@@ -61,6 +64,18 @@
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#include "base/spinlock.h"
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#include "maybe_threads.h"
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+// Some Linux systems don't have sigev_notify_thread_id defined in
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+// signal.h (despite having SIGEV_THREAD_ID defined) and also lack
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+// working linux/signal.h. So lets workaround. Note, we know that at
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+// least on Linux sigev_notify_thread_id is macro.
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+//
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+// See https://sourceware.org/bugzilla/show_bug.cgi?id=27417 and
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+// https://bugzilla.kernel.org/show_bug.cgi?id=200081
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+//
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+#if __linux__ && HAVE_LINUX_SIGEV_THREAD_ID && !defined(sigev_notify_thread_id)
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+#define sigev_notify_thread_id _sigev_un._tid
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+#endif
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+
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using std::list;
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using std::string;
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@@ -272,7 +287,7 @@ static void StartLinuxThreadTimer(int timer_type, int signal_number,
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struct itimerspec its;
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memset(&sevp, 0, sizeof(sevp));
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sevp.sigev_notify = SIGEV_THREAD_ID;
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- sevp._sigev_un._tid = sys_gettid();
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+ sevp.sigev_notify_thread_id = sys_gettid();
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sevp.sigev_signo = signal_number;
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clockid_t clock = CLOCK_THREAD_CPUTIME_ID;
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if (timer_type == ITIMER_REAL) {
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