finish os.h amalgamation

1 files changed, 138 insertions, 0 deletions

diff --git a/os-win.c b/os-win.c
index df32cdf..ff29359 100644
--- a/os-win.c
+++ b/os-win.c
@@ -126,3 +126,141 @@ void time_sleep_ns(u64 ns) {
 	// windows....
 	Sleep((DWORD)(ns / 1000000));
 }
+
+#error "@TODO :  implement process_write, separate_stderr, working_directory"
+
+#include "process.h"
+
+struct Process {
+	HANDLE pipe_read, pipe_write;
+	HANDLE job;
+	PROCESS_INFORMATION process_info;
+	char error[200];
+};
+
+static void get_last_error_str(char *out, size_t out_sz) {
+	size_t size = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+         NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), out, (DWORD)out_sz - 1, NULL);
+	out[size] = 0;
+	char *cr = strchr(out, '\r');
+	if (cr) *cr = '\0'; // get rid of carriage return+newline at end of error
+}
+
+bool process_run(Process *process, char const *command) {
+	// thanks to https://stackoverflow.com/a/35658917 for the pipe code
+	// thanks to https://devblogs.microsoft.com/oldnewthing/20131209-00/?p=2433 for the job code
+
+	bool success = false;
+	memset(process, 0, sizeof *process);
+	char *command_line = str_dup(command);
+	if (!command_line) {
+		strbuf_printf(process->error, "Out of memory.");
+		return false;
+	}
+	// we need to create a "job" for this, because when you kill a process on windows,
+	// all its children just keep going. so cmd.exe would die, but not the actual build process.
+	// jobs fix this, apparently.
+	HANDLE job = CreateJobObjectA(NULL, NULL);
+	if (job) {
+		JOBOBJECT_EXTENDED_LIMIT_INFORMATION job_info = {0};
+		job_info.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
+		SetInformationJobObject(job, JobObjectExtendedLimitInformation, &job_info, sizeof job_info);
+		HANDLE pipe_read, pipe_write;
+		SECURITY_ATTRIBUTES security_attrs = {sizeof(SECURITY_ATTRIBUTES)};
+		security_attrs.bInheritHandle = TRUE;
+		if (CreatePipe(&pipe_read, &pipe_write, &security_attrs, 0)) {
+			STARTUPINFOA startup = {sizeof(STARTUPINFOA)};
+			startup.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
+			startup.hStdOutput = pipe_write;
+			startup.hStdError = pipe_write;
+			startup.wShowWindow = SW_HIDE;
+			PROCESS_INFORMATION *process_info = &process->process_info;
+			if (CreateProcessA(NULL, command_line, NULL, NULL, TRUE, CREATE_NEW_CONSOLE | CREATE_SUSPENDED,
+				NULL, NULL, &startup, process_info)) {
+				// create a suspended process, add it to the job, then resume (unsuspend) the process
+				if (AssignProcessToJobObject(job, process_info->hProcess)) {
+					if (ResumeThread(process_info->hThread) != (DWORD)-1) {
+						process->job = job;
+						process->pipe_read = pipe_read;
+						process->pipe_write = pipe_write;
+						success = true;
+					}
+				}
+				if (!success) {
+					TerminateProcess(process_info->hProcess, 1);
+					CloseHandle(process_info->hProcess);
+					CloseHandle(process_info->hThread);
+				}
+			} else {
+				char buf[150];
+				get_last_error_str(buf, sizeof buf);
+				strbuf_printf(process->error, "Couldn't run `%s`: %s", command, buf);
+			}
+			free(command_line);
+			if (!success) {
+				CloseHandle(pipe_read);
+				CloseHandle(pipe_write);
+			}
+		} else {
+			char buf[150];
+			get_last_error_str(buf, sizeof buf);
+			strbuf_printf(process->error, "Couldn't create pipe: %s", buf);
+		}
+		if (!success)
+			CloseHandle(job);
+	}
+	return success;
+}
+
+char const *process_geterr(Process *p) {
+	return *p->error ? p->error : NULL;
+}
+
+long long process_read(Process *process, char *data, size_t size) {
+	DWORD bytes_read = 0, bytes_avail = 0, bytes_left = 0;
+	if (PeekNamedPipe(process->pipe_read, data, (DWORD)size, &bytes_read, &bytes_avail, &bytes_left)) {
+		if (bytes_read == 0) {
+			return -1;
+		} else {
+			ReadFile(process->pipe_read, data, (DWORD)size, &bytes_read, NULL); // make sure data is removed from pipe
+			return bytes_read;
+		}
+	} else {
+		char buf[150];
+		get_last_error_str(buf, sizeof buf);
+		strbuf_printf(process->error, "Couldn't read from pipe: %s", buf);
+		return -2;
+	}
+}
+
+void process_kill(Process *process) {
+	CloseHandle(process->job);
+	CloseHandle(process->pipe_read);
+	CloseHandle(process->pipe_write);
+	CloseHandle(process->process_info.hProcess);
+	CloseHandle(process->process_info.hThread);
+}
+
+int process_check_status(Process *process, char *message, size_t message_size) {
+	HANDLE hProcess = process->process_info.hProcess;
+	DWORD exit_code = 1;
+	if (GetExitCodeProcess(hProcess, &exit_code)) {
+		if (exit_code == STILL_ACTIVE) {
+			return 0;
+		} else {
+			process_kill(process);
+			if (exit_code == 0) {
+				str_printf(message, message_size, "exited successfully");
+				return +1;
+			} else {
+				str_printf(message, message_size, "exited with code %d", (int)exit_code);
+				return -1;
+			}
+		}
+	} else {
+		// something has gone wrong.
+		str_printf(message, message_size, "couldn't get process exit status");
+		process_kill(process);
+		return -1;
+	}
+}