initial commit

libsystrace.pro

@@ -0,0 +1,21 @@
+VERSION = 0.0.0
+
+TEMPLATE = lib
+TARGET = systrace
+CONFIG -= qt
+
+SOURCES = \
+    src/systrace.c
+
+HEADERS = \
+    src/systrace.h
+
+headers.path = $$[QT_INSTALL_PREFIX]/include
+headers.files += $$HEADERS
+INSTALLS += headers
+
+target.path = $$[QT_INSTALL_LIBS]
+INSTALLS += target
+
+CONFIG += create_pc create_prl no_install_prl
+QMAKE_PKGCONFIG_DESTDIR = pkgconfig

rpm/libsystrace.spec

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+Name: libsystrace
+Version: 0.0.0
+Release: 1
+Summary: A library for logging systrace data.
+Group: System/Libraries
+License: BSD
+URL: https://github.com/mer-packages/
+Source0: %{name}-%{version}.tar.bz2
+BuildRequires: qt5-qmake
+Requires(post): /sbin/ldconfig
+Requires(postun): /sbin/ldconfig
+
+%description
+%summary.
+
+%package devel
+Summary: Development files for %{name}
+Group: System/Libraries
+
+%description devel
+%{summary}.
+
+%prep
+%setup -q -n %{name}-%{version}
+
+%build
+%qmake5
+make %{?_smp_mflags}
+
+%install
+rm -rf %{buildroot}
+%qmake5_install
+
+%clean
+rm -rf %{buildroot}
+
+%files
+%defattr(-,root,root,-)
+%{_libdir}/libsystrace.so.*
+
+%files devel
+%defattr(-,root,root,-)
+%{_libdir}/libsystrace.so
+%{_libdir}/pkgconfig/systrace.pc
+%{_includedir}/systrace.h

src/systrace.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2014 Jolla Ltd. <robin.burchell@jollamobile.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * "Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Nemo Mobile nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "systrace.h"
+
+pthread_mutex_t systrace_trace_mutex;
+FILE *systrace_trace_target;
+
+__attribute__((constructor)) void systrace_init()
+{
+    pthread_mutex_init(&systrace_trace_mutex, NULL);
+    systrace_trace_target = fopen("/sys/kernel/debug/tracing/trace_marker", "a");
+    if (!systrace_trace_target)
+        perror("can't open /sys/kernel/debug/tracing/trace_marker");
+}
+
+__attribute__((destructor)) void systrace_deinit() {
+    pthread_mutex_destroy(&systrace_trace_mutex);
+    if (systrace_trace_target)
+        fclose(systrace_trace_target);
+}
+
+static char systrace_got_areas = 0;
+static char *systrace_areas = NULL;
+
+int systrace_should_trace(const char *module, const char *tracepoint)
+{
+    (void)tracepoint; /* not used at present */
+    if (!systrace_got_areas) {
+        systrace_got_areas = 1;
+        systrace_areas = getenv("SYSTRACE_AREA");
+    }
+
+    if (!systrace_areas || !module) {
+        /* no areas enabled */
+        return 0;
+    }
+
+    /* TODO: caching of areas would prevent constant rescanning, if we care. */
+    return strstr(systrace_areas, module) != NULL;
+}
+

src/systrace.h

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+/*
+ * Copyright (C) 2014 Jolla Ltd. <robin.burchell@jollamobile.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * "Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Nemo Mobile nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ */
+
+#ifndef SYSTRACE_H
+
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+extern pthread_mutex_t systrace_trace_mutex;
+extern FILE *systrace_trace_target;
+extern int systrace_should_trace(const char *module, const char *tracepoint);
+
+#ifdef __cplusplus
+}
+#endif
+
+#define SYSTRACE_RECORD(module, what, tracepoint, message, ...) do { \
+          if (systrace_should_trace(module, tracepoint)) { \
+              pthread_mutex_lock(&systrace_trace_mutex); \
+              if (what == 'B') \
+                 fprintf(systrace_trace_target, "B|%i|%s::%s" message "", \
+                    getpid(), tracepoint, module, ##__VA_ARGS__); \
+              else if (what == 'E') \
+                 fprintf(systrace_trace_target, "E"); \
+              else \
+                 fprintf(systrace_trace_target, "C|%i|%s::%s-%i|" message "", \
+                    getpid(), tracepoint, module, getpid(), ##__VA_ARGS__); \
+              fflush(systrace_trace_target); \
+              pthread_mutex_unlock(&systrace_trace_mutex); \
+          } \
+      } while(0)
+#define SYSTRACE_BEGIN(module, tracepoint, message, ...) SYSTRACE_RECORD(module, 'B', tracepoint, message, ##__VA_ARGS__)
+#define SYSTRACE_END(module, tracepoint, message, ...) SYSTRACE_RECORD(module, 'E', tracepoint, message, ##__VA_ARGS__)
+#define SYSTRACE_COUNTER(module, tracepoint, message, ...) SYSTRACE_RECORD(module, 'C', tracepoint, message, ##__VA_ARGS__)
+
+#endif // SYSTRACE_H