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From d4e5b6e1e5585d341d1e51f1ddc637c099111076 Mon Sep 17 00:00:00 2001
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From: Joe Orton <jorton@redhat.com>
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Date: Tue, 7 Jul 2020 09:48:01 +0100
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Subject: [PATCH] Check and use gettid() directly with glibc 2.30+.
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* configure.in: Check for gettid() and define HAVE_SYS_GETTID if
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gettid() is only usable via syscall().
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* server/log.c (log_tid): Use gettid() directly if available.
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---
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configure.in | 14 +++++++++-----
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server/log.c | 8 ++++++--
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2 files changed, 15 insertions(+), 7 deletions(-)
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diff --git a/configure.in b/configure.in
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index 423d58d4b9a..60cbf7b7f81 100644
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--- httpd-2.4.43/configure.in.gettid
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+++ httpd-2.4.43/configure.in
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@@ -478,7 +500,8 @@
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timegm \
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getpgid \
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fopen64 \
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-getloadavg
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+getloadavg \
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+gettid
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)
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dnl confirm that a void pointer is large enough to store a long integer
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@@ -489,16 +512,19 @@
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APR_ADDTO(HTTPD_LIBS, [-lselinux])
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])
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-AC_CACHE_CHECK([for gettid()], ac_cv_gettid,
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+if test $ac_cv_func_gettid = no; then
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+ # On Linux before glibc 2.30, gettid() is only usable via syscall()
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+ AC_CACHE_CHECK([for gettid() via syscall], ap_cv_gettid,
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[AC_TRY_RUN(#define _GNU_SOURCE
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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int main(int argc, char **argv) {
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pid_t t = syscall(SYS_gettid); return t == -1 ? 1 : 0; },
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-[ac_cv_gettid=yes], [ac_cv_gettid=no], [ac_cv_gettid=no])])
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-if test "$ac_cv_gettid" = "yes"; then
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- AC_DEFINE(HAVE_GETTID, 1, [Define if you have gettid()])
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+ [ap_cv_gettid=yes], [ap_cv_gettid=no], [ap_cv_gettid=no])])
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+ if test "$ap_cv_gettid" = "yes"; then
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+ AC_DEFINE(HAVE_SYS_GETTID, 1, [Define if you have gettid() via syscall()])
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+ fi
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fi
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dnl ## Check for the tm_gmtoff field in struct tm to get the timezone diffs
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--- httpd-2.4.43/server/log.c.gettid
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+++ httpd-2.4.43/server/log.c
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@@ -55,7 +55,7 @@
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#include "ap_mpm.h"
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#include "ap_listen.h"
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-#if HAVE_GETTID
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+#if HAVE_SYS_GETTID
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#include <sys/syscall.h>
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#include <sys/types.h>
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#endif
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@@ -625,14 +625,18 @@
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#if APR_HAS_THREADS
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int result;
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#endif
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-#if HAVE_GETTID
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+#if defined(HAVE_GETTID) || defined(HAVE_SYS_GETTID)
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if (arg && *arg == 'g') {
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+#ifdef HAVE_GETTID
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+ pid_t tid = gettid();
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+#else
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pid_t tid = syscall(SYS_gettid);
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+#endif
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if (tid == -1)
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return 0;
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return apr_snprintf(buf, buflen, "%"APR_PID_T_FMT, tid);
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}
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-#endif
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+#endif /* HAVE_GETTID || HAVE_SYS_GETTID */
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#if APR_HAS_THREADS
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if (ap_mpm_query(AP_MPMQ_IS_THREADED, &result) == APR_SUCCESS
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&& result != AP_MPMQ_NOT_SUPPORTED)
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@@ -966,7 +970,7 @@
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#if APR_HAS_THREADS
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field_start = len;
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len += cpystrn(buf + len, ":tid ", buflen - len);
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- item_len = log_tid(info, NULL, buf + len, buflen - len);
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+ item_len = log_tid(info, "g", buf + len, buflen - len);
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if (!item_len)
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len = field_start;
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else
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