Hotspot UI

src/SysExec.cpp

@@ -0,0 +1,96 @@
+#include "pch.h"
+#include "SysExec.hpp"
+#include <sys/wait.h>
+#include <filesystem>
+#include "PiPedalException.hpp"
+#include <string.h>
+#include <unistd.h>
+
+using namespace pipedal;
+using namespace std;
+
+
+// find on path, but ONLY /usr/bin and /usr/sbin
+
+static std::filesystem::path findOnSystemPath(const std::string &command)
+{
+    if (command.length() != 0 && command[0] == '/')
+    {
+        return command;
+    }
+    std::string path = "/usr/bin:/usr/sbin";
+    std::vector<std::string> paths;
+    size_t t = 0;
+    while (t < path.length())
+    {
+        size_t pos = path.find(':', t);
+        if (pos == string::npos)
+        {
+            pos = path.length();
+        }
+        std::string thisPath = path.substr(t, pos - t);
+        std::filesystem::path path = std::filesystem::path(thisPath) / command;
+        if (std::filesystem::exists(path))
+        {
+            return path;
+        }
+        t = pos + 1;
+    }
+    std::stringstream s;
+    s << "'" << command << "' is not installed.";
+    throw PiPedalException(s.str());
+}
+
+
+
+int pipedal::SysExec(const char*szCommand) {
+    char*args = strdup(szCommand);
+    int argc;
+    std::vector<char*> argv;
+
+    char *p = args;
+    while (*p) {
+        argv.push_back(p);
+
+        while (*p && *p != ' ') {
+            ++p;
+        }
+        if (*p) {
+            *p++ = '\0';
+            while (*p && *p == ' ') 
+            {
+                ++p;
+            }
+        }
+    }
+    argv.push_back(nullptr);
+
+    std::filesystem::path execPath = argv[0];
+    if (execPath.is_relative())
+    {
+        execPath = findOnSystemPath(execPath);
+    }
+    if (!std::filesystem::exists(execPath))
+    {
+        throw PiPedalException( SS("Path does not exist: " << execPath << "."));
+    }
+    argv[0] = (char*)(execPath.c_str());
+    
+    
+    char**rawArgv = &argv[0];
+    int pbPid;
+    int returnValue = 0;
+
+    if ((pbPid = fork()) == 0)
+    {
+        execv(argv[0], rawArgv);
+        exit(-1);
+    }
+    else
+    {
+        free((void*)args);
+        waitpid(pbPid, &returnValue, 0);
+        int exitStatus = WEXITSTATUS(returnValue);
+        return exitStatus;
+    }
+}