mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-10-22 00:22:57 -05:00
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
#include "prx/libc/include/general/VabiMacros.hpp"
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#include <cstdio>
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#include <cstring>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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extern "C" {
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int APS5_VABI fcntl_nid_postfix(int, int, ...);
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}
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namespace {
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constexpr int GuestGetFlags = 3;
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int Child(const char* closed) {
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struct stat null{};
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if (::stat("/dev/null", &null) != 0) return 70;
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for (int descriptor = 0; descriptor <= 2; ++descriptor) {
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struct stat status{};
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if (::fstat(descriptor, &status) != 0) return 71 + descriptor;
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if (closed[descriptor] != '1') continue;
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if (!S_ISCHR(status.st_mode) || status.st_rdev != null.st_rdev) return 74 + descriptor;
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if ((::fcntl(descriptor, F_GETFL) & O_ACCMODE) != (descriptor == 0 ? O_RDONLY : O_WRONLY)) return 77 + descriptor;
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}
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if (closed[0] == '1' && fcntl_nid_postfix(0, GuestGetFlags) < 0) return 80;
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return 0;
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}
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int RunClosed(const char* self, bool closeInput, bool closeOutput, bool closeError) {
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const pid_t child = ::fork();
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if (child < 0) return -1;
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if (child == 0) {
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if (closeInput) ::close(0);
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if (closeOutput) ::close(1);
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if (closeError) ::close(2);
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char closed[] = {closeInput ? '1' : '0', closeOutput ? '1' : '0', closeError ? '1' : '0', '\0'};
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char* const arguments[] = {const_cast<char*>(self), const_cast<char*>("--closed-child"), closed, nullptr};
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::execv(self, arguments);
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::_exit(69);
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}
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int status = 0;
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if (::waitpid(child, &status, 0) != child) return -1;
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return WIFEXITED(status) ? WEXITSTATUS(status) : 128 + WTERMSIG(status);
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}
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}
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int main(int argc, char** argv) {
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if (argc > 2 && std::strcmp(argv[1], "--closed-child") == 0 && std::strlen(argv[2]) == 3) return Child(argv[2]);
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const struct { bool input, output, error; const char* name; } cases[] = {
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{true, false, false, "stdin"},
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{false, true, false, "stdout"},
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{true, true, true, "all three"},
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};
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for (const auto& test : cases) {
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const int result = RunClosed(argv[0], test.input, test.output, test.error);
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if (result != 0) {
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std::fprintf(stderr, "closed standard descriptors, %s: child exited with %d\n", test.name, result);
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return 1;
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}
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}
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std::puts("closed standard descriptors are reopened on /dev/null");
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return 0;
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}
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