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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207394 91177308-0d34-0410-b5e6-96231b3b80d8
375 lines
12 KiB
C++
375 lines
12 KiB
C++
//===- Unix/Process.cpp - Unix Process Implementation --------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the generic Unix implementation of the Process class.
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//
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/TimeValue.h"
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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// DragonFlyBSD, OpenBSD, and Bitrig have deprecated <malloc.h> for
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// <stdlib.h> instead. Unix.h includes this for us already.
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#if defined(HAVE_MALLOC_H) && !defined(__DragonFly__) && \
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!defined(__OpenBSD__) && !defined(__Bitrig__)
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#include <malloc.h>
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#endif
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#ifdef HAVE_MALLOC_MALLOC_H
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#include <malloc/malloc.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#ifdef HAVE_TERMIOS_H
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# include <termios.h>
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#endif
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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using namespace llvm;
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using namespace sys;
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process::id_type self_process::get_id() {
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return getpid();
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}
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static std::pair<TimeValue, TimeValue> getRUsageTimes() {
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#if defined(HAVE_GETRUSAGE)
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struct rusage RU;
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::getrusage(RUSAGE_SELF, &RU);
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return std::make_pair(
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TimeValue(
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static_cast<TimeValue::SecondsType>(RU.ru_utime.tv_sec),
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static_cast<TimeValue::NanoSecondsType>(
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RU.ru_utime.tv_usec * TimeValue::NANOSECONDS_PER_MICROSECOND)),
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TimeValue(
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static_cast<TimeValue::SecondsType>(RU.ru_stime.tv_sec),
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static_cast<TimeValue::NanoSecondsType>(
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RU.ru_stime.tv_usec * TimeValue::NANOSECONDS_PER_MICROSECOND)));
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#else
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#warning Cannot get usage times on this platform
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return std::make_pair(TimeValue(), TimeValue());
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#endif
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}
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TimeValue self_process::get_user_time() const {
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#if _POSIX_TIMERS > 0 && _POSIX_CPUTIME > 0
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// Try to get a high resolution CPU timer.
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struct timespec TS;
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if (::clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &TS) == 0)
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return TimeValue(static_cast<TimeValue::SecondsType>(TS.tv_sec),
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static_cast<TimeValue::NanoSecondsType>(TS.tv_nsec));
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#endif
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// Otherwise fall back to rusage based timing.
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return getRUsageTimes().first;
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}
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TimeValue self_process::get_system_time() const {
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// We can only collect system time by inspecting the results of getrusage.
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return getRUsageTimes().second;
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}
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// On Cygwin, getpagesize() returns 64k(AllocationGranularity) and
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// offset in mmap(3) should be aligned to the AllocationGranularity.
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static unsigned getPageSize() {
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#if defined(HAVE_GETPAGESIZE)
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const int page_size = ::getpagesize();
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#elif defined(HAVE_SYSCONF)
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long page_size = ::sysconf(_SC_PAGE_SIZE);
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#else
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#warning Cannot get the page size on this machine
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#endif
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return static_cast<unsigned>(page_size);
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}
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// This constructor guaranteed to be run exactly once on a single thread, and
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// sets up various process invariants that can be queried cheaply from then on.
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self_process::self_process() : PageSize(getPageSize()) {
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}
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size_t Process::GetMallocUsage() {
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#if defined(HAVE_MALLINFO)
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struct mallinfo mi;
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mi = ::mallinfo();
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return mi.uordblks;
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#elif defined(HAVE_MALLOC_ZONE_STATISTICS) && defined(HAVE_MALLOC_MALLOC_H)
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malloc_statistics_t Stats;
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malloc_zone_statistics(malloc_default_zone(), &Stats);
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return Stats.size_in_use; // darwin
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#elif defined(HAVE_SBRK)
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// Note this is only an approximation and more closely resembles
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// the value returned by mallinfo in the arena field.
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static char *StartOfMemory = reinterpret_cast<char*>(::sbrk(0));
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char *EndOfMemory = (char*)sbrk(0);
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if (EndOfMemory != ((char*)-1) && StartOfMemory != ((char*)-1))
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return EndOfMemory - StartOfMemory;
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else
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return 0;
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#else
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#warning Cannot get malloc info on this platform
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return 0;
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#endif
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}
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void Process::GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
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TimeValue &sys_time) {
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elapsed = TimeValue::now();
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std::tie(user_time, sys_time) = getRUsageTimes();
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}
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#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
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#include <mach/mach.h>
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#endif
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// Some LLVM programs such as bugpoint produce core files as a normal part of
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// their operation. To prevent the disk from filling up, this function
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// does what's necessary to prevent their generation.
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void Process::PreventCoreFiles() {
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#if HAVE_SETRLIMIT
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struct rlimit rlim;
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rlim.rlim_cur = rlim.rlim_max = 0;
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setrlimit(RLIMIT_CORE, &rlim);
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#endif
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#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
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// Disable crash reporting on Mac OS X 10.0-10.4
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// get information about the original set of exception ports for the task
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mach_msg_type_number_t Count = 0;
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exception_mask_t OriginalMasks[EXC_TYPES_COUNT];
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exception_port_t OriginalPorts[EXC_TYPES_COUNT];
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exception_behavior_t OriginalBehaviors[EXC_TYPES_COUNT];
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thread_state_flavor_t OriginalFlavors[EXC_TYPES_COUNT];
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kern_return_t err =
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task_get_exception_ports(mach_task_self(), EXC_MASK_ALL, OriginalMasks,
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&Count, OriginalPorts, OriginalBehaviors,
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OriginalFlavors);
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if (err == KERN_SUCCESS) {
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// replace each with MACH_PORT_NULL.
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for (unsigned i = 0; i != Count; ++i)
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task_set_exception_ports(mach_task_self(), OriginalMasks[i],
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MACH_PORT_NULL, OriginalBehaviors[i],
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OriginalFlavors[i]);
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}
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// Disable crash reporting on Mac OS X 10.5
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signal(SIGABRT, _exit);
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signal(SIGILL, _exit);
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signal(SIGFPE, _exit);
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signal(SIGSEGV, _exit);
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signal(SIGBUS, _exit);
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#endif
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}
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Optional<std::string> Process::GetEnv(StringRef Name) {
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std::string NameStr = Name.str();
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const char *Val = ::getenv(NameStr.c_str());
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if (!Val)
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return None;
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return std::string(Val);
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}
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error_code Process::GetArgumentVector(SmallVectorImpl<const char *> &ArgsOut,
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ArrayRef<const char *> ArgsIn,
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SpecificBumpPtrAllocator<char> &) {
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ArgsOut.append(ArgsIn.begin(), ArgsIn.end());
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return error_code::success();
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}
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bool Process::StandardInIsUserInput() {
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return FileDescriptorIsDisplayed(STDIN_FILENO);
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}
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bool Process::StandardOutIsDisplayed() {
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return FileDescriptorIsDisplayed(STDOUT_FILENO);
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}
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bool Process::StandardErrIsDisplayed() {
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return FileDescriptorIsDisplayed(STDERR_FILENO);
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}
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bool Process::FileDescriptorIsDisplayed(int fd) {
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#if HAVE_ISATTY
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return isatty(fd);
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#else
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// If we don't have isatty, just return false.
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return false;
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#endif
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}
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static unsigned getColumns(int FileID) {
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// If COLUMNS is defined in the environment, wrap to that many columns.
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if (const char *ColumnsStr = std::getenv("COLUMNS")) {
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int Columns = std::atoi(ColumnsStr);
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if (Columns > 0)
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return Columns;
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}
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unsigned Columns = 0;
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#if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_TERMIOS_H)
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// Try to determine the width of the terminal.
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struct winsize ws;
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if (ioctl(FileID, TIOCGWINSZ, &ws) == 0)
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Columns = ws.ws_col;
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#endif
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return Columns;
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}
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unsigned Process::StandardOutColumns() {
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if (!StandardOutIsDisplayed())
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return 0;
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return getColumns(1);
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}
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unsigned Process::StandardErrColumns() {
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if (!StandardErrIsDisplayed())
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return 0;
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return getColumns(2);
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}
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#ifdef HAVE_TERMINFO
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// We manually declare these extern functions because finding the correct
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// headers from various terminfo, curses, or other sources is harder than
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// writing their specs down.
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extern "C" int setupterm(char *term, int filedes, int *errret);
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extern "C" struct term *set_curterm(struct term *termp);
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extern "C" int del_curterm(struct term *termp);
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extern "C" int tigetnum(char *capname);
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#endif
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static bool terminalHasColors(int fd) {
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#ifdef HAVE_TERMINFO
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// First, acquire a global lock because these C routines are thread hostile.
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static sys::Mutex M;
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MutexGuard G(M);
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int errret = 0;
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if (setupterm((char *)nullptr, fd, &errret) != 0)
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// Regardless of why, if we can't get terminfo, we shouldn't try to print
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// colors.
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return false;
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// Test whether the terminal as set up supports color output. How to do this
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// isn't entirely obvious. We can use the curses routine 'has_colors' but it
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// would be nice to avoid a dependency on curses proper when we can make do
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// with a minimal terminfo parsing library. Also, we don't really care whether
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// the terminal supports the curses-specific color changing routines, merely
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// if it will interpret ANSI color escape codes in a reasonable way. Thus, the
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// strategy here is just to query the baseline colors capability and if it
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// supports colors at all to assume it will translate the escape codes into
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// whatever range of colors it does support. We can add more detailed tests
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// here if users report them as necessary.
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//
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// The 'tigetnum' routine returns -2 or -1 on errors, and might return 0 if
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// the terminfo says that no colors are supported.
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bool HasColors = tigetnum(const_cast<char *>("colors")) > 0;
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// Now extract the structure allocated by setupterm and free its memory
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// through a really silly dance.
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struct term *termp = set_curterm((struct term *)nullptr);
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(void)del_curterm(termp); // Drop any errors here.
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// Return true if we found a color capabilities for the current terminal.
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if (HasColors)
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return true;
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#endif
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// Otherwise, be conservative.
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return false;
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}
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bool Process::FileDescriptorHasColors(int fd) {
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// A file descriptor has colors if it is displayed and the terminal has
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// colors.
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return FileDescriptorIsDisplayed(fd) && terminalHasColors(fd);
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}
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bool Process::StandardOutHasColors() {
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return FileDescriptorHasColors(STDOUT_FILENO);
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}
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bool Process::StandardErrHasColors() {
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return FileDescriptorHasColors(STDERR_FILENO);
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}
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void Process::UseANSIEscapeCodes(bool /*enable*/) {
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// No effect.
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}
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bool Process::ColorNeedsFlush() {
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// No, we use ANSI escape sequences.
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return false;
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}
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const char *Process::OutputColor(char code, bool bold, bool bg) {
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return colorcodes[bg?1:0][bold?1:0][code&7];
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}
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const char *Process::OutputBold(bool bg) {
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return "\033[1m";
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}
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const char *Process::OutputReverse() {
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return "\033[7m";
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}
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const char *Process::ResetColor() {
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return "\033[0m";
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}
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#if !defined(HAVE_DECL_ARC4RANDOM) || !HAVE_DECL_ARC4RANDOM
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static unsigned GetRandomNumberSeed() {
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// Attempt to get the initial seed from /dev/urandom, if possible.
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if (FILE *RandomSource = ::fopen("/dev/urandom", "r")) {
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unsigned seed;
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int count = ::fread((void *)&seed, sizeof(seed), 1, RandomSource);
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::fclose(RandomSource);
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// Return the seed if the read was successful.
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if (count == 1)
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return seed;
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}
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// Otherwise, swizzle the current time and the process ID to form a reasonable
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// seed.
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TimeValue Now = TimeValue::now();
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return hash_combine(Now.seconds(), Now.nanoseconds(), ::getpid());
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}
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#endif
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unsigned llvm::sys::Process::GetRandomNumber() {
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#if defined(HAVE_DECL_ARC4RANDOM) && HAVE_DECL_ARC4RANDOM
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return arc4random();
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#else
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static int x = (::srand(GetRandomNumberSeed()), 0);
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(void)x;
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return ::rand();
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#endif
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}
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