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#include "process.h"
struct Process {
HANDLE pipe_read, pipe_write;
PROCESS_INFORMATION process_info;
char error[64];
};
bool process_exec(Process *process, char const *program, char **argv) {
// thanks to https://stackoverflow.com/a/35658917
bool success = false;
memset(process, 0, sizeof *process);
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;
// fuckin windows
char command_line[4096];
strbuf_cpy(command_line, program);
strbuf_catf(command_line, " ");
for (int i = 0; argv[i]; ++i) {
strbuf_catf(command_line, "%s ", argv[i]);
}
if (CreateProcessA(NULL, command_line, NULL, NULL, TRUE, CREATE_NEW_CONSOLE,
NULL, NULL, &startup, &process->process_info)) {
process->pipe_read = pipe_read;
process->pipe_write = pipe_write;
success = true;
} else {
strbuf_printf(process->error, "Couldn't create process (error code %u)", (unsigned)GetLastError());
}
if (!success) {
CloseHandle(pipe_read);
CloseHandle(pipe_write);
}
} else {
strbuf_printf(process->error, "Couldn't create pipe (error code %u)", (unsigned)GetLastError());
}
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 {
strbuf_printf(process->error, "Couldn't read from pipe (error code %u)", (unsigned)GetLastError());
return -2;
}
}
void process_kill(Process *process) {
TerminateProcess(process->process_info.hProcess, 1);
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;
}
}
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