forked from OSchip/llvm-project
451 lines
13 KiB
C++
451 lines
13 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/ManagedStatic.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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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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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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// DragonFlyBSD, and OpenBSD 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__)
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#include <malloc.h>
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#endif
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#if defined(HAVE_MALLCTL)
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#include <malloc_np.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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static std::pair<std::chrono::microseconds, std::chrono::microseconds> 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 { toDuration(RU.ru_utime), toDuration(RU.ru_stime) };
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#else
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#warning Cannot get usage times on this platform
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return { std::chrono::microseconds::zero(), std::chrono::microseconds::zero() };
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#endif
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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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unsigned Process::getPageSize() {
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#if defined(HAVE_GETPAGESIZE)
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static const int page_size = ::getpagesize();
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#elif defined(HAVE_SYSCONF)
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static 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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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_MALLCTL)
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size_t alloc, sz;
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sz = sizeof(size_t);
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if (mallctl("stats.allocated", &alloc, &sz, NULL, 0) == 0)
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return alloc;
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return 0;
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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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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(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
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std::chrono::nanoseconds &sys_time) {
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elapsed = std::chrono::system_clock::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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coreFilesPrevented = true;
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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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std::error_code
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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 std::error_code();
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}
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namespace {
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class FDCloser {
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public:
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FDCloser(int &FD) : FD(FD), KeepOpen(false) {}
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void keepOpen() { KeepOpen = true; }
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~FDCloser() {
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if (!KeepOpen && FD >= 0)
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::close(FD);
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}
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private:
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FDCloser(const FDCloser &) = delete;
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void operator=(const FDCloser &) = delete;
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int &FD;
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bool KeepOpen;
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};
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}
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std::error_code Process::FixupStandardFileDescriptors() {
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int NullFD = -1;
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FDCloser FDC(NullFD);
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const int StandardFDs[] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
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for (int StandardFD : StandardFDs) {
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struct stat st;
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errno = 0;
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if (RetryAfterSignal(-1, fstat, StandardFD, &st) < 0) {
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assert(errno && "expected errno to be set if fstat failed!");
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// fstat should return EBADF if the file descriptor is closed.
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if (errno != EBADF)
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return std::error_code(errno, std::generic_category());
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}
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// if fstat succeeds, move on to the next FD.
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if (!errno)
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continue;
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assert(errno == EBADF && "expected errno to have EBADF at this point!");
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if (NullFD < 0) {
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if ((NullFD = RetryAfterSignal(-1, open, "/dev/null", O_RDWR)) < 0)
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return std::error_code(errno, std::generic_category());
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}
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if (NullFD == StandardFD)
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FDC.keepOpen();
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else if (dup2(NullFD, StandardFD) < 0)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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std::error_code Process::SafelyCloseFileDescriptor(int FD) {
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// Create a signal set filled with *all* signals.
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sigset_t FullSet;
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if (sigfillset(&FullSet) < 0)
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return std::error_code(errno, std::generic_category());
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// Atomically swap our current signal mask with a full mask.
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sigset_t SavedSet;
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#if LLVM_ENABLE_THREADS
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if (int EC = pthread_sigmask(SIG_SETMASK, &FullSet, &SavedSet))
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return std::error_code(EC, std::generic_category());
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#else
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if (sigprocmask(SIG_SETMASK, &FullSet, &SavedSet) < 0)
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return std::error_code(errno, std::generic_category());
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#endif
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// Attempt to close the file descriptor.
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// We need to save the error, if one occurs, because our subsequent call to
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// pthread_sigmask might tamper with errno.
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int ErrnoFromClose = 0;
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if (::close(FD) < 0)
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ErrnoFromClose = errno;
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// Restore the signal mask back to what we saved earlier.
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int EC = 0;
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#if LLVM_ENABLE_THREADS
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EC = pthread_sigmask(SIG_SETMASK, &SavedSet, nullptr);
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#else
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if (sigprocmask(SIG_SETMASK, &SavedSet, nullptr) < 0)
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EC = errno;
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#endif
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// The error code from close takes precedence over the one from
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// pthread_sigmask.
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if (ErrnoFromClose)
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return std::error_code(ErrnoFromClose, std::generic_category());
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return std::error_code(EC, std::generic_category());
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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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#ifdef HAVE_TERMINFO
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static ManagedStatic<sys::Mutex> TermColorMutex;
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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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MutexGuard G(*TermColorMutex);
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int errret = 0;
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if (setupterm(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(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 !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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int urandomFD = open("/dev/urandom", O_RDONLY);
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if (urandomFD != -1) {
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unsigned seed;
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// Don't use a buffered read to avoid reading more data
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// from /dev/urandom than we need.
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int count = read(urandomFD, (void *)&seed, sizeof(seed));
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close(urandomFD);
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// Return the seed if the read was successful.
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if (count == sizeof(seed))
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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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const auto Now = std::chrono::high_resolution_clock::now();
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return hash_combine(Now.time_since_epoch().count(), ::getpid());
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}
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#endif
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unsigned llvm::sys::Process::GetRandomNumber() {
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#if HAVE_DECL_ARC4RANDOM
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return arc4random();
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#else
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static int x = (static_cast<void>(::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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