119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
#include <algorithm>
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#include <cstring>
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#include "current-process.hh"
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#include "namespaces.hh"
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#include "util.hh"
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#include "finally.hh"
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#include "file-system.hh"
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#include "processes.hh"
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#include "signals.hh"
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#ifdef __APPLE__
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# include <mach-o/dyld.h>
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#endif
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#if __linux__
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# include <mutex>
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# include <sys/resource.h>
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# include "cgroup.hh"
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#endif
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#include <sys/mount.h>
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namespace nix {
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unsigned int getMaxCPU()
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{
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#if __linux__
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try {
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auto cgroupFS = getCgroupFS();
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if (!cgroupFS) return 0;
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auto cgroups = getCgroups("/proc/self/cgroup");
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auto cgroup = cgroups[""];
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if (cgroup == "") return 0;
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auto cpuFile = *cgroupFS + "/" + cgroup + "/cpu.max";
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auto cpuMax = readFile(cpuFile);
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auto cpuMaxParts = tokenizeString<std::vector<std::string>>(cpuMax, " \n");
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auto quota = cpuMaxParts[0];
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auto period = cpuMaxParts[1];
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if (quota != "max")
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return std::ceil(std::stoi(quota) / std::stof(period));
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} catch (Error &) { ignoreException(lvlDebug); }
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#endif
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return 0;
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}
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//////////////////////////////////////////////////////////////////////
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rlim_t savedStackSize = 0;
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void setStackSize(rlim_t stackSize)
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{
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struct rlimit limit;
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if (getrlimit(RLIMIT_STACK, &limit) == 0 && limit.rlim_cur < stackSize) {
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savedStackSize = limit.rlim_cur;
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limit.rlim_cur = std::min(stackSize, limit.rlim_max);
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if (setrlimit(RLIMIT_STACK, &limit) != 0) {
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logger->log(
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lvlError,
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hintfmt(
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"Failed to increase stack size from %1% to %2% (maximum allowed stack size: %3%): %4%",
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savedStackSize,
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stackSize,
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limit.rlim_max,
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std::strerror(errno)
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).str()
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);
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}
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}
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}
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void restoreProcessContext(bool restoreMounts)
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{
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restoreSignals();
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if (restoreMounts) {
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restoreMountNamespace();
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}
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if (savedStackSize) {
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struct rlimit limit;
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if (getrlimit(RLIMIT_STACK, &limit) == 0) {
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limit.rlim_cur = savedStackSize;
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setrlimit(RLIMIT_STACK, &limit);
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}
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}
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}
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//////////////////////////////////////////////////////////////////////
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std::optional<Path> getSelfExe()
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{
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static auto cached = []() -> std::optional<Path>
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{
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#if __linux__
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return readLink("/proc/self/exe");
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#elif __APPLE__
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char buf[1024];
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uint32_t size = sizeof(buf);
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if (_NSGetExecutablePath(buf, &size) == 0)
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return buf;
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else
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return std::nullopt;
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#else
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return std::nullopt;
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#endif
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}();
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return cached;
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}
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}
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