Function TryCloseAllFileDescriptors

Sources/Shared/IO/FileSystem.cpp:426–454

		}

		static void TryCloseAllFileDescriptors()
		{
			DIR* d = ::opendir("/proc/self/fd/");
			if (d == nullptr) {
				const long fd_max = ::sysconf(_SC_OPEN_MAX);
				long fd;
				for (fd = 0; fd <= fd_max; fd++) {
					::close(fd);
				}
				return;
			}

			std::int32_t dfd = ::dirfd(d);
			struct dirent* ent;
			while ((ent = ::readdir(d)) != nullptr) {
				if (ent->d_name[0] >= '0' && ent->d_name[0] <= '9') {
					const char* p = &ent->d_name[1];
					std::int32_t fd = ent->d_name[0] - '0';
					while (*p >= '0' && *p <= '9') {
						fd = (10 * fd) + *(p++) - '0';
					}
					if (*p || fd == dfd) {
						continue;
					}
					::close(fd);
				}
			}
			::closedir(d);
		}
#	endif
#endif