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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /tools/jprof/stub/libmalloc.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'tools/jprof/stub/libmalloc.cpp')
-rw-r--r--tools/jprof/stub/libmalloc.cpp790
1 files changed, 790 insertions, 0 deletions
diff --git a/tools/jprof/stub/libmalloc.cpp b/tools/jprof/stub/libmalloc.cpp
new file mode 100644
index 000000000..2da2a37b3
--- /dev/null
+++ b/tools/jprof/stub/libmalloc.cpp
@@ -0,0 +1,790 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+// vim:cindent:sw=4:et:ts=8:
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// The linux glibc hides part of sigaction if _POSIX_SOURCE is defined
+#if defined(linux)
+#undef _POSIX_SOURCE
+#undef _SVID_SOURCE
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#endif
+
+#include <errno.h>
+#if defined(linux)
+#include <linux/rtc.h>
+#include <pthread.h>
+#endif
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <ucontext.h>
+#include <execinfo.h>
+
+#include "libmalloc.h"
+#include "jprof.h"
+#include <string.h>
+#include <errno.h>
+#include <dlfcn.h>
+
+// Must define before including jprof.h
+void *moz_xmalloc(size_t size)
+{
+ return malloc(size);
+}
+
+void moz_xfree(void *mem)
+{
+ free(mem);
+}
+
+#ifdef NTO
+#include <sys/link.h>
+extern r_debug _r_debug;
+#else
+#include <link.h>
+#endif
+
+#define USE_GLIBC_BACKTRACE 1
+// To debug, use #define JPROF_STATIC
+#define JPROF_STATIC static
+
+static int gLogFD = -1;
+static pthread_t main_thread;
+
+static bool gIsSlave = false;
+static int gFilenamePID;
+
+static void startSignalCounter(unsigned long millisec);
+static int enableRTCSignals(bool enable);
+
+
+//----------------------------------------------------------------------
+// replace use of atexit()
+
+static void DumpAddressMap();
+
+struct JprofShutdown {
+ JprofShutdown() {}
+ ~JprofShutdown() {
+ DumpAddressMap();
+ }
+};
+
+static void RegisterJprofShutdown() {
+ // This instanciates the dummy class above, and will trigger the class
+ // destructor when libxul is unloaded. This is equivalent to atexit(),
+ // but gracefully handles dlclose().
+ static JprofShutdown t;
+}
+
+#if defined(i386) || defined(_i386) || defined(__x86_64__)
+JPROF_STATIC void CrawlStack(malloc_log_entry* me,
+ void* stack_top, void* top_instr_ptr)
+{
+#if USE_GLIBC_BACKTRACE
+ // This probably works on more than x86! But we need a way to get the
+ // top instruction pointer, which is kindof arch-specific
+ void *array[500];
+ int cnt, i;
+ u_long numpcs = 0;
+
+ // This is from glibc. A more generic version might use
+ // libunwind and/or CaptureStackBackTrace() on Windows
+ cnt = backtrace(&array[0],sizeof(array)/sizeof(array[0]));
+
+ // StackHook->JprofLog->CrawlStack
+ // Then we have sigaction, which replaced top_instr_ptr
+ array[3] = top_instr_ptr;
+ for (i = 3; i < cnt; i++)
+ {
+ me->pcs[numpcs++] = (char *) array[i];
+ }
+ me->numpcs = numpcs;
+
+#else
+ // original code - this breaks on many platforms
+ void **bp;
+#if defined(__i386)
+ __asm__( "movl %%ebp, %0" : "=g"(bp));
+#elif defined(__x86_64__)
+ __asm__( "movq %%rbp, %0" : "=g"(bp));
+#else
+ // It would be nice if this worked uniformly, but at least on i386 and
+ // x86_64, it stopped working with gcc 4.1, because it points to the
+ // end of the saved registers instead of the start.
+ bp = __builtin_frame_address(0);
+#endif
+ u_long numpcs = 0;
+ bool tracing = false;
+
+ me->pcs[numpcs++] = (char*) top_instr_ptr;
+
+ while (numpcs < MAX_STACK_CRAWL) {
+ void** nextbp = (void**) *bp++;
+ void* pc = *bp;
+ if (nextbp < bp) {
+ break;
+ }
+ if (tracing) {
+ // Skip the signal handling.
+ me->pcs[numpcs++] = (char*) pc;
+ }
+ else if (pc == top_instr_ptr) {
+ tracing = true;
+ }
+ bp = nextbp;
+ }
+ me->numpcs = numpcs;
+#endif
+}
+#endif
+
+//----------------------------------------------------------------------
+
+static int rtcHz;
+static int rtcFD = -1;
+static bool circular = false;
+
+#if defined(linux) || defined(NTO)
+static void DumpAddressMap()
+{
+ // Turn off the timer so we don't get interrupts during shutdown
+#if defined(linux)
+ if (rtcHz) {
+ enableRTCSignals(false);
+ } else
+#endif
+ {
+ startSignalCounter(0);
+ }
+
+ char filename[2048];
+ if (gIsSlave)
+ snprintf(filename, sizeof(filename), "%s-%d", M_MAPFILE, gFilenamePID);
+ else
+ snprintf(filename, sizeof(filename), "%s", M_MAPFILE);
+
+ int mfd = open(filename, O_CREAT|O_WRONLY|O_TRUNC, 0666);
+ if (mfd >= 0) {
+ malloc_map_entry mme;
+ link_map* map = _r_debug.r_map;
+ while (nullptr != map) {
+ if (map->l_name && *map->l_name) {
+ mme.nameLen = strlen(map->l_name);
+ mme.address = map->l_addr;
+ write(mfd, &mme, sizeof(mme));
+ write(mfd, map->l_name, mme.nameLen);
+#if 0
+ write(1, map->l_name, mme.nameLen);
+ write(1, "\n", 1);
+#endif
+ }
+ map = map->l_next;
+ }
+ close(mfd);
+ }
+}
+#endif
+
+static bool was_paused = true;
+
+JPROF_STATIC void JprofBufferDump();
+JPROF_STATIC void JprofBufferClear();
+
+static void ClearProfilingHook(int signum)
+{
+ if (circular) {
+ JprofBufferClear();
+ puts("Jprof: cleared circular buffer.");
+ }
+}
+
+static void EndProfilingHook(int signum)
+{
+ if (circular)
+ JprofBufferDump();
+
+ DumpAddressMap();
+ was_paused = true;
+ puts("Jprof: profiling paused.");
+}
+
+
+
+//----------------------------------------------------------------------
+// proper usage would be a template, including the function to find the
+// size of an entry, or include a size header explicitly to each entry.
+#if defined(linux)
+#define DUMB_LOCK() pthread_mutex_lock(&mutex);
+#define DUMB_UNLOCK() pthread_mutex_unlock(&mutex);
+#else
+#define DUMB_LOCK() FIXME()
+#define DUMB_UNLOCK() FIXME()
+#endif
+
+
+class DumbCircularBuffer
+{
+public:
+ DumbCircularBuffer(size_t init_buffer_size) {
+ used = 0;
+ buffer_size = init_buffer_size;
+ buffer = (unsigned char *) malloc(buffer_size);
+ head = tail = buffer;
+
+#if defined(linux)
+ pthread_mutexattr_t mAttr;
+ pthread_mutexattr_settype(&mAttr, PTHREAD_MUTEX_RECURSIVE_NP);
+ pthread_mutex_init(&mutex, &mAttr);
+ pthread_mutexattr_destroy(&mAttr);
+#endif
+ }
+ ~DumbCircularBuffer() {
+ free(buffer);
+#if defined(linux)
+ pthread_mutex_destroy (&mutex);
+#endif
+ }
+
+ void clear() {
+ DUMB_LOCK();
+ head = tail;
+ used = 0;
+ DUMB_UNLOCK();
+ }
+
+ bool empty() {
+ return head == tail;
+ }
+
+ size_t space_available() {
+ size_t result;
+ DUMB_LOCK();
+ if (tail > head)
+ result = buffer_size - (tail-head) - 1;
+ else
+ result = head-tail - 1;
+ DUMB_UNLOCK();
+ return result;
+ }
+
+ void drop(size_t size) {
+ // assumes correctness!
+ DUMB_LOCK();
+ head += size;
+ if (head >= &buffer[buffer_size])
+ head -= buffer_size;
+ used--;
+ DUMB_UNLOCK();
+ }
+
+ bool insert(void *data, size_t size) {
+ // can fail if not enough space in the entire buffer
+ DUMB_LOCK();
+ if (space_available() < size)
+ return false;
+
+ size_t max_without_wrap = &buffer[buffer_size] - tail;
+ size_t initial = size > max_without_wrap ? max_without_wrap : size;
+#if DEBUG_CIRCULAR
+ fprintf(stderr,"insert(%d): max_without_wrap %d, size %d, initial %d\n",used,max_without_wrap,size,initial);
+#endif
+ memcpy(tail,data,initial);
+ tail += initial;
+ data = ((char *)data)+initial;
+ size -= initial;
+ if (size != 0) {
+#if DEBUG_CIRCULAR
+ fprintf(stderr,"wrapping by %d bytes\n",size);
+#endif
+ memcpy(buffer,data,size);
+ tail = &(((unsigned char *)buffer)[size]);
+ }
+
+ used++;
+ DUMB_UNLOCK();
+
+ return true;
+ }
+
+ // for external access to the buffer (saving)
+ void lock() {
+ DUMB_LOCK();
+ }
+
+ void unlock() {
+ DUMB_UNLOCK();
+ }
+
+ // XXX These really shouldn't be public...
+ unsigned char *head;
+ unsigned char *tail;
+ unsigned int used;
+ unsigned char *buffer;
+ size_t buffer_size;
+
+private:
+ pthread_mutex_t mutex;
+};
+
+class DumbCircularBuffer *JprofBuffer;
+
+JPROF_STATIC void
+JprofBufferInit(size_t size)
+{
+ JprofBuffer = new DumbCircularBuffer(size);
+}
+
+JPROF_STATIC void
+JprofBufferClear()
+{
+ fprintf(stderr,"Told to clear JPROF circular buffer\n");
+ JprofBuffer->clear();
+}
+
+JPROF_STATIC size_t
+JprofEntrySizeof(malloc_log_entry *me)
+{
+ return offsetof(malloc_log_entry, pcs) + me->numpcs*sizeof(char*);
+}
+
+JPROF_STATIC void
+JprofBufferAppend(malloc_log_entry *me)
+{
+ size_t size = JprofEntrySizeof(me);
+
+ do {
+ while (JprofBuffer->space_available() < size &&
+ JprofBuffer->used > 0) {
+#if DEBUG_CIRCULAR
+ fprintf(stderr,"dropping entry: %d in use, %d free, need %d, size_to_free = %d\n",
+ JprofBuffer->used,JprofBuffer->space_available(),size,JprofEntrySizeof((malloc_log_entry *) JprofBuffer->head));
+#endif
+ JprofBuffer->drop(JprofEntrySizeof((malloc_log_entry *) JprofBuffer->head));
+ }
+ if (JprofBuffer->space_available() < size)
+ return;
+
+ } while (!JprofBuffer->insert(me,size));
+}
+
+JPROF_STATIC void
+JprofBufferDump()
+{
+ JprofBuffer->lock();
+#if DEBUG_CIRCULAR
+ fprintf(stderr,"dumping JP_CIRCULAR buffer, %d of %d bytes\n",
+ JprofBuffer->tail > JprofBuffer->head ?
+ JprofBuffer->tail - JprofBuffer->head :
+ JprofBuffer->buffer_size + JprofBuffer->tail - JprofBuffer->head,
+ JprofBuffer->buffer_size);
+#endif
+ if (JprofBuffer->tail >= JprofBuffer->head) {
+ write(gLogFD, JprofBuffer->head, JprofBuffer->tail - JprofBuffer->head);
+ } else {
+ write(gLogFD, JprofBuffer->head, &(JprofBuffer->buffer[JprofBuffer->buffer_size]) - JprofBuffer->head);
+ write(gLogFD, JprofBuffer->buffer, JprofBuffer->tail - JprofBuffer->buffer);
+ }
+ JprofBuffer->clear();
+ JprofBuffer->unlock();
+}
+
+//----------------------------------------------------------------------
+
+JPROF_STATIC void
+JprofLog(u_long aTime, void* stack_top, void* top_instr_ptr)
+{
+ // Static is simply to make debugging tolerable
+ static malloc_log_entry me;
+
+ me.delTime = aTime;
+ me.thread = syscall(SYS_gettid); //gettid();
+ if (was_paused) {
+ me.flags = JP_FIRST_AFTER_PAUSE;
+ was_paused = 0;
+ } else {
+ me.flags = 0;
+ }
+
+ CrawlStack(&me, stack_top, top_instr_ptr);
+
+#ifndef NTO
+ if (circular) {
+ JprofBufferAppend(&me);
+ } else {
+ write(gLogFD, &me, JprofEntrySizeof(&me));
+ }
+#else
+ printf("Neutrino is missing the pcs member of malloc_log_entry!! \n");
+#endif
+}
+
+static int realTime;
+
+/* Lets interrupt at 10 Hz. This is so my log files don't get too large.
+ * This can be changed to a faster value latter. This timer is not
+ * programmed to reset, even though it is capable of doing so. This is
+ * to keep from getting interrupts from inside of the handler.
+*/
+static void startSignalCounter(unsigned long millisec)
+{
+ struct itimerval tvalue;
+
+ tvalue.it_interval.tv_sec = 0;
+ tvalue.it_interval.tv_usec = 0;
+ tvalue.it_value.tv_sec = millisec/1000;
+ tvalue.it_value.tv_usec = (millisec%1000)*1000;
+
+ if (realTime) {
+ setitimer(ITIMER_REAL, &tvalue, nullptr);
+ } else {
+ setitimer(ITIMER_PROF, &tvalue, nullptr);
+ }
+}
+
+static long timerMilliSec = 50;
+
+#if defined(linux)
+static int setupRTCSignals(int hz, struct sigaction *sap)
+{
+ /* global */ rtcFD = open("/dev/rtc", O_RDONLY);
+ if (rtcFD < 0) {
+ perror("JPROF_RTC setup: open(\"/dev/rtc\", O_RDONLY)");
+ return 0;
+ }
+
+ if (sigaction(SIGIO, sap, nullptr) == -1) {
+ perror("JPROF_RTC setup: sigaction(SIGIO)");
+ return 0;
+ }
+
+ if (ioctl(rtcFD, RTC_IRQP_SET, hz) == -1) {
+ perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_IRQP_SET, $JPROF_RTC_HZ)");
+ return 0;
+ }
+
+ if (ioctl(rtcFD, RTC_PIE_ON, 0) == -1) {
+ perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_PIE_ON)");
+ return 0;
+ }
+
+ if (fcntl(rtcFD, F_SETSIG, 0) == -1) {
+ perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETSIG, 0)");
+ return 0;
+ }
+
+ if (fcntl(rtcFD, F_SETOWN, getpid()) == -1) {
+ perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETOWN, getpid())");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int enableRTCSignals(bool enable)
+{
+ static bool enabled = false;
+ if (enabled == enable) {
+ return 0;
+ }
+ enabled = enable;
+
+ int flags = fcntl(rtcFD, F_GETFL);
+ if (flags < 0) {
+ perror("JPROF_RTC setup: fcntl(/dev/rtc, F_GETFL)");
+ return 0;
+ }
+
+ if (enable) {
+ flags |= FASYNC;
+ } else {
+ flags &= ~FASYNC;
+ }
+
+ if (fcntl(rtcFD, F_SETFL, flags) == -1) {
+ if (enable) {
+ perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags | FASYNC)");
+ } else {
+ perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags & ~FASYNC)");
+ }
+ return 0;
+ }
+
+ return 1;
+}
+#endif
+
+JPROF_STATIC void StackHook(
+int signum,
+siginfo_t *info,
+void *ucontext)
+{
+ static struct timeval tFirst;
+ static int first=1;
+ size_t millisec = 0;
+
+#if defined(linux)
+ if (rtcHz && pthread_self() != main_thread) {
+ // Only collect stack data on the main thread, for now.
+ return;
+ }
+#endif
+
+ if(first && !(first=0)) {
+ puts("Jprof: received first signal");
+#if defined(linux)
+ if (rtcHz) {
+ enableRTCSignals(true);
+ } else
+#endif
+ {
+ gettimeofday(&tFirst, 0);
+ millisec = 0;
+ }
+ } else {
+#if defined(linux)
+ if (rtcHz) {
+ enableRTCSignals(true);
+ } else
+#endif
+ {
+ struct timeval tNow;
+ gettimeofday(&tNow, 0);
+ double usec = 1e6*(tNow.tv_sec - tFirst.tv_sec);
+ usec += (tNow.tv_usec - tFirst.tv_usec);
+ millisec = static_cast<size_t>(usec*1e-3);
+ }
+ }
+
+ gregset_t &gregs = ((ucontext_t*)ucontext)->uc_mcontext.gregs;
+#ifdef __x86_64__
+ JprofLog(millisec, (void*)gregs[REG_RSP], (void*)gregs[REG_RIP]);
+#else
+ JprofLog(millisec, (void*)gregs[REG_ESP], (void*)gregs[REG_EIP]);
+#endif
+
+ if (!rtcHz)
+ startSignalCounter(timerMilliSec);
+}
+
+NS_EXPORT_(void) setupProfilingStuff(void)
+{
+ static int gFirstTime = 1;
+ char filename[2048]; // XXX fix
+
+ if(gFirstTime && !(gFirstTime=0)) {
+ int startTimer = 1;
+ int doNotStart = 1;
+ int firstDelay = 0;
+ int append = O_TRUNC;
+ char *tst = getenv("JPROF_FLAGS");
+
+ /* Options from JPROF_FLAGS environment variable:
+ * JP_DEFER -> Wait for a SIGPROF (or SIGALRM, if JP_REALTIME
+ * is set) from userland before starting
+ * to generate them internally
+ * JP_START -> Install the signal handler
+ * JP_PERIOD -> Time between profiler ticks
+ * JP_FIRST -> Extra delay before starting
+ * JP_REALTIME -> Take stack traces in intervals of real time
+ * rather than time used by the process (and the
+ * system for the process). This is useful for
+ * finding time spent by the X server.
+ * JP_APPEND -> Append to jprof-log rather than overwriting it.
+ * This is somewhat risky since it depends on the
+ * address map staying constant across multiple runs.
+ * JP_FILENAME -> base filename to use when saving logs. Note that
+ * this does not affect the mapfile.
+ * JP_CIRCULAR -> use a circular buffer of size N, write/clear on SIGUSR1
+ *
+ * JPROF_SLAVE is set if this is not the first process.
+ */
+
+ circular = false;
+
+ if(tst) {
+ if(strstr(tst, "JP_DEFER"))
+ {
+ doNotStart = 0;
+ startTimer = 0;
+ }
+ if(strstr(tst, "JP_START")) doNotStart = 0;
+ if(strstr(tst, "JP_REALTIME")) realTime = 1;
+ if(strstr(tst, "JP_APPEND")) append = O_APPEND;
+
+ char *delay = strstr(tst,"JP_PERIOD=");
+ if(delay) {
+ double tmp = strtod(delay+strlen("JP_PERIOD="), nullptr);
+ if (tmp>=1e-3) {
+ timerMilliSec = static_cast<unsigned long>(1000 * tmp);
+ } else {
+ fprintf(stderr,
+ "JP_PERIOD of %g less than 0.001 (1ms), using 1ms\n",
+ tmp);
+ timerMilliSec = 1;
+ }
+ }
+
+ char *circular_op = strstr(tst,"JP_CIRCULAR=");
+ if(circular_op) {
+ size_t size = atol(circular_op+strlen("JP_CIRCULAR="));
+ if (size < 1000) {
+ fprintf(stderr,
+ "JP_CIRCULAR of %lu less than 1000, using 10000\n",
+ (unsigned long) size);
+ size = 10000;
+ }
+ JprofBufferInit(size);
+ fprintf(stderr,"JP_CIRCULAR buffer of %lu bytes\n", (unsigned long) size);
+ circular = true;
+ }
+
+ char *first = strstr(tst, "JP_FIRST=");
+ if(first) {
+ firstDelay = atol(first+strlen("JP_FIRST="));
+ }
+
+ char *rtc = strstr(tst, "JP_RTC_HZ=");
+ if (rtc) {
+#if defined(linux)
+ rtcHz = atol(rtc+strlen("JP_RTC_HZ="));
+ timerMilliSec = 0; /* This makes JP_FIRST work right. */
+ realTime = 1; /* It's the _R_TC and all. ;) */
+
+#define IS_POWER_OF_TWO(x) (((x) & ((x) - 1)) == 0)
+
+ if (!IS_POWER_OF_TWO(rtcHz) || rtcHz < 2) {
+ fprintf(stderr, "JP_RTC_HZ must be power of two and >= 2, "
+ "but %d was provided; using default of 2048\n",
+ rtcHz);
+ rtcHz = 2048;
+ }
+#else
+ fputs("JP_RTC_HZ found, but RTC profiling only supported on "
+ "Linux!\n", stderr);
+
+#endif
+ }
+ const char *f = strstr(tst,"JP_FILENAME=");
+ if (f)
+ f = f + strlen("JP_FILENAME=");
+ else
+ f = M_LOGFILE;
+
+ char *is_slave = getenv("JPROF_SLAVE");
+ if (!is_slave)
+ setenv("JPROF_SLAVE","", 0);
+ gIsSlave = !!is_slave;
+
+ gFilenamePID = syscall(SYS_gettid); //gettid();
+ if (is_slave)
+ snprintf(filename,sizeof(filename),"%s-%d",f,gFilenamePID);
+ else
+ snprintf(filename,sizeof(filename),"%s",f);
+
+ // XXX FIX! inherit current capture state!
+ }
+
+ if(!doNotStart) {
+
+ if(gLogFD<0) {
+ gLogFD = open(filename, O_CREAT | O_WRONLY | append, 0666);
+ if(gLogFD<0) {
+ fprintf(stderr, "Unable to create " M_LOGFILE);
+ perror(":");
+ } else {
+ struct sigaction action;
+ sigset_t mset;
+
+ // Dump out the address map when we terminate
+ RegisterJprofShutdown();
+
+ main_thread = pthread_self();
+ //fprintf(stderr,"jprof: main_thread = %u\n",
+ // (unsigned int)main_thread);
+
+ // FIX! probably should block these against each other
+ // Very unlikely.
+ sigemptyset(&mset);
+ action.sa_handler = nullptr;
+ action.sa_sigaction = StackHook;
+ action.sa_mask = mset;
+ action.sa_flags = SA_RESTART | SA_SIGINFO;
+#if defined(linux)
+ if (rtcHz) {
+ if (!setupRTCSignals(rtcHz, &action)) {
+ fputs("jprof: Error initializing RTC, NOT "
+ "profiling\n", stderr);
+ return;
+ }
+ }
+
+ if (!rtcHz || firstDelay != 0)
+#endif
+ {
+ if (realTime) {
+ sigaction(SIGALRM, &action, nullptr);
+ }
+ }
+ // enable PROF in all cases to simplify JP_DEFER/pause/restart
+ sigaction(SIGPROF, &action, nullptr);
+
+ // make it so a SIGUSR1 will stop the profiling
+ // Note: It currently does not close the logfile.
+ // This could be configurable (so that it could
+ // later be reopened).
+
+ struct sigaction stop_action;
+ stop_action.sa_handler = EndProfilingHook;
+ stop_action.sa_mask = mset;
+ stop_action.sa_flags = SA_RESTART;
+ sigaction(SIGUSR1, &stop_action, nullptr);
+
+ // make it so a SIGUSR2 will clear the circular buffer
+
+ stop_action.sa_handler = ClearProfilingHook;
+ stop_action.sa_mask = mset;
+ stop_action.sa_flags = SA_RESTART;
+ sigaction(SIGUSR2, &stop_action, nullptr);
+
+ printf("Jprof: Initialized signal handler and set "
+ "timer for %lu %s, %d s "
+ "initial delay\n",
+ rtcHz ? rtcHz : timerMilliSec,
+ rtcHz ? "Hz" : "ms",
+ firstDelay);
+
+ if(startTimer) {
+#if defined(linux)
+ /* If we have an initial delay we can just use
+ startSignalCounter to set up a timer to fire the
+ first stackHook after that delay. When that happens
+ we'll go and switch to RTC profiling. */
+ if (rtcHz && firstDelay == 0) {
+ puts("Jprof: enabled RTC signals");
+ enableRTCSignals(true);
+ } else
+#endif
+ {
+ puts("Jprof: started timer");
+ startSignalCounter(firstDelay*1000 + timerMilliSec);
+ }
+ }
+ }
+ }
+ }
+ } else {
+ printf("setupProfilingStuff() called multiple times\n");
+ }
+}