PiPedal 1.2.33 initial commit
This commit is contained in:
Robin Davies
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// Copyright (c) 2022 Robin Davies
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include "SysExec.hpp"
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#include <sys/wait.h>
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#include <filesystem>
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#include <stdexcept>
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#include <thread>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <linux/limits.h> // for PATH_MAX
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#include <vector>
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#include <string>
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#include "ss.hpp"
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#include <stdlib.h>
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#include <fcntl.h>
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using namespace pipedal;
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using namespace std;
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#pragma GCC diagnostic ignored "-Wunused-result"
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// find on path, but ONLY /usr/bin and /usr/sbin
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static std::filesystem::path findOnSystemPath(const std::string &command)
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{
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if (command.length() != 0 && command[0] == '/')
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{
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return command;
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}
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std::string path = "/usr/bin:/usr/sbin";
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std::vector<std::string> paths;
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size_t t = 0;
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while (t < path.length())
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{
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size_t pos = path.find(':', t);
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if (pos == string::npos)
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{
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pos = path.length();
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}
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std::string thisPath = path.substr(t, pos - t);
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std::filesystem::path path = std::filesystem::path(thisPath) / command;
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if (std::filesystem::exists(path))
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{
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return path;
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}
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t = pos + 1;
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}
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std::stringstream s;
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s << "'" << command << "' is not installed.";
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throw std::runtime_error(s.str());
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}
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int pipedal::silentSysExec(const char *szCommand)
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{
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std::stringstream s;
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s << szCommand << " 2>&1";
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FILE *output = popen(s.str().c_str(), "r");
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char buffer[512];
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if (output)
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{
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while (!feof(output))
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{
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fgets(buffer, sizeof(buffer), output);
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}
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return pclose(output);
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}
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return -1;
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}
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int pipedal::sysExec(const char *szCommand)
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{
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char *args = strdup(szCommand);
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int argc;
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std::vector<char *> argv;
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char *p = args;
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while (*p)
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{
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argv.push_back(p);
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while (*p && *p != ' ')
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{
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++p;
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}
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if (*p)
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{
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*p++ = '\0';
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while (*p && *p == ' ')
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{
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++p;
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}
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}
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}
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argv.push_back(nullptr);
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std::filesystem::path execPath = argv[0];
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if (execPath.is_relative())
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{
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execPath = findOnSystemPath(execPath);
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}
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if (!std::filesystem::exists(execPath))
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{
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free((void *)args);
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throw std::runtime_error(SS("Path does not exist: " << execPath << "."));
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}
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argv[0] = (char *)(execPath.c_str());
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char **rawArgv = &argv[0];
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int pbPid;
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int returnValue = 0;
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if ((pbPid = fork()) == 0)
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{
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execv(argv[0], rawArgv);
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exit(-1);
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}
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else
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{
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free((void *)args);
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waitpid(pbPid, &returnValue, 0);
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int exitStatus = WEXITSTATUS(returnValue);
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return exitStatus;
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}
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}
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std::string pipedal::getSelfExePath()
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{
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char result[PATH_MAX+1];
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ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
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if (count < 0) throw std::runtime_error("Can't find EXE path.");
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result[count] = 0;
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return result;
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}
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ProcessId pipedal::sysExecAsync(const std::string&command)
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{
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char *args = strdup(command.c_str());
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int argc;
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std::vector<char *> argv;
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char *p = args;
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while (*p)
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{
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argv.push_back(p);
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while (*p && *p != ' ')
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{
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++p;
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}
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if (*p)
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{
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*p++ = '\0';
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while (*p && *p == ' ')
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{
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++p;
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}
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}
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}
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argv.push_back(nullptr);
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std::filesystem::path execPath = argv[0];
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if (execPath.is_relative())
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{
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execPath = findOnSystemPath(execPath);
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}
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if (!std::filesystem::exists(execPath))
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{
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free((void *)args);
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throw std::runtime_error(SS("Path does not exist: " << execPath << "."));
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}
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argv[0] = (char *)(execPath.c_str());
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char **rawArgv = &argv[0];
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int pbPid;
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if ((pbPid = fork()) == 0)
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{
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// redirect output to /dev/null
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int null_fd = open("/dev/null",O_WRONLY);
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if (null_fd == -1)
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{
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std::cerr << "Failed to open /dev/null" << std::endl;
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exit(EXIT_FAILURE);
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}
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dup2(null_fd,STDOUT_FILENO);
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dup2(null_fd,STDERR_FILENO);
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close(null_fd);
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return execv(argv[0], rawArgv);
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}
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else
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{
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free((void *)args);
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return pbPid;
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}
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}
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void pipedal::sysExecTerminate(ProcessId pid_,int termTimeoutMs,int killTimeoutMs )
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{
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pid_t pid = (pid_t)pid_;
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if (pid == -1) return;
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if (kill(pid,SIGTERM) == -1) {
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throw std::runtime_error("Failed to send SIGTERM");
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}
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auto start = std::chrono::steady_clock::now();
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int status;
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do {
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pid_t result;
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result = waitpid(pid,&status,WNOHANG);
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if (result > 0)
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{
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return;
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}
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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} while (
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std::chrono::duration_cast<std::chrono::milliseconds>(
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std::chrono::steady_clock::now()-start).count() < termTimeoutMs
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);
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start = std::chrono::steady_clock::now();
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if (kill(pid,SIGKILL) == -1) // some odd async effect?
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{
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return;
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}
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do {
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pid_t result;
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result = waitpid(pid,&status,WNOHANG);
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if (result > 0)
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{
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return;
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}
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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} while (
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std::chrono::duration_cast<std::chrono::milliseconds>(
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std::chrono::steady_clock::now()-start).count() < killTimeoutMs
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);
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throw std::runtime_error("Failed to terminate process.");
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}
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int pipedal::sysExecWait(ProcessId pid_)
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{
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pid_t pid = (pid_t)pid_;
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int returnValue;
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waitpid(pid, &returnValue, 0);
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int exitStatus = WEXITSTATUS(returnValue);
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return exitStatus;
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}
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