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Current Path : /opt/cpanel/ea-ruby27/src/passenger-release-6.0.23/src/agent/Shared/Fundamentals/ |
Current File : //opt/cpanel/ea-ruby27/src/passenger-release-6.0.23/src/agent/Shared/Fundamentals/Utils.cpp |
/* * Phusion Passenger - https://www.phusionpassenger.com/ * Copyright (c) 2010-2017 Phusion Holding B.V. * * "Passenger", "Phusion Passenger" and "Union Station" are registered * trademarks of Phusion Holding B.V. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <Shared/Fundamentals/Utils.h> #include <oxt/backtrace.hpp> #include <cstdlib> #include <cstring> #include <signal.h> #include <fcntl.h> #include <unistd.h> namespace Passenger { namespace Agent { namespace Fundamentals { using namespace std; const char * getEnvString(const char *name, const char *defaultValue) { const char *value = getenv(name); if (value != NULL && *value != '\0') { return value; } else { return defaultValue; } } bool getEnvBool(const char *name, bool defaultValue) { const char *value = getEnvString(name); if (value != NULL) { return strcmp(value, "yes") == 0 || strcmp(value, "y") == 0 || strcmp(value, "1") == 0 || strcmp(value, "on") == 0 || strcmp(value, "true") == 0; } else { return defaultValue; } } void ignoreSigpipe() { struct sigaction action; action.sa_handler = SIG_IGN; action.sa_flags = 0; sigemptyset(&action.sa_mask); sigaction(SIGPIPE, &action, NULL); } /** * Linux-only way to change OOM killer configuration for * current process. Requires root privileges, which we * should have. * * Returns 0 on success, or an errno code on error. * * This function is async signal-safe. */ int tryRestoreOomScore(const StaticString &scoreString, bool &isLegacy) { TRACE_POINT(); if (scoreString.empty()) { return 0; } int fd, ret, e; size_t written = 0; StaticString score; if (scoreString.at(0) == 'l') { isLegacy = true; score = scoreString.substr(1); fd = open("/proc/self/oom_adj", O_WRONLY | O_TRUNC, 0600); } else { isLegacy = false; score = scoreString; fd = open("/proc/self/oom_score_adj", O_WRONLY | O_TRUNC, 0600); } if (fd == -1) { return errno; } do { ret = write(fd, score.data() + written, score.size() - written); if (ret != -1) { written += ret; } } while (ret == -1 && errno != EAGAIN && written < score.size()); e = errno; close(fd); if (ret == -1) { return e; } else { return 0; } } } // namespace Fundamentals } // namespace Agent } // namespace Passenger