Reworking the build system

1 files changed, 323 insertions, 0 deletions

diff --git a/kit/process.posix.c b/kit/process.posix.c
new file mode 100644
index 0000000..d9bec1f
--- /dev/null
+++ b/kit/process.posix.c
@@ -0,0 +1,323 @@
+#include "process.h"
+
+#if !defined(_WIN32) || defined(__CYGWIN__)
+#  include "status.h"
+
+#  include <assert.h>
+#  include <fcntl.h>
+#  include <signal.h>
+#  include <sys/wait.h>
+
+static char *kit_process_argv_null_[] = { "", NULL };
+static char *kit_process_env_null_[]  = { NULL };
+
+static char *kit_process_str_(kit_str_t s) {
+  //  FIXME
+  //
+
+  return BS(s);
+}
+
+static char **kit_init_argv_(kit_process_args_t args, u32 flags) {
+  //  TODO
+  //
+
+  if ((flags & KIT_PROCESS_NO_ARGUMENTS) != 0)
+    return kit_process_argv_null_;
+
+  (void) args;
+
+  return NULL;
+}
+
+static char **kit_init_envp_(kit_process_env_t env, u32 flags) {
+  //  TODO
+  //
+
+  if ((flags & KIT_PROCESS_NO_ENVIRONMENT) != 0)
+    return kit_process_env_null_;
+
+  (void) env;
+
+  return NULL;
+}
+
+s32 kit_process_init(kit_process_t *p, kit_process_info_t info) {
+  assert(p != NULL);
+  assert(info.working_directory.size == 0 ||
+         info.working_directory.values != NULL);
+
+  if (p == NULL || (info.working_directory.size != 0 &&
+                    info.working_directory.values == NULL))
+    return KIT_ERROR_INVALID_ARGUMENT;
+
+  memset(p, 0, sizeof *p);
+
+  p->_stdin  = -1;
+  p->_stdout = -1;
+  p->_stderr = -1;
+
+  signal(SIGCHLD, SIG_IGN);
+  signal(SIGALRM, SIG_IGN); // pipes
+
+  i32 pipe_in[2];
+  i32 pipe_out[2];
+  i32 pipe_err[2];
+
+  if ((info.flags & KIT_PROCESS_NO_PIPES) == 0) {
+    if (pipe(pipe_in) == -1) {
+      assert(0);
+      return KIT_ERROR_PIPE_FAILED;
+    }
+
+    if (pipe(pipe_out) == -1) {
+      assert(0);
+      close(pipe_in[0]);
+      close(pipe_in[1]);
+      return KIT_ERROR_PIPE_FAILED;
+    }
+
+    if (pipe(pipe_err) == -1) {
+      assert(0);
+      close(pipe_in[0]);
+      close(pipe_in[1]);
+      close(pipe_out[0]);
+      close(pipe_out[1]);
+      return KIT_ERROR_PIPE_FAILED;
+    }
+
+    //  non-blocking writing for stdout, stderr
+    if (fcntl(pipe_out[1], F_SETFL, O_NONBLOCK) == -1 ||
+        fcntl(pipe_err[1], F_SETFL, O_NONBLOCK) == -1) {
+      assert(0);
+      close(pipe_in[0]);
+      close(pipe_in[1]);
+      close(pipe_out[0]);
+      close(pipe_out[1]);
+      close(pipe_err[0]);
+      close(pipe_err[1]);
+      return KIT_ERROR_PIPE_FAILED;
+    }
+  }
+
+  pid_t id = fork();
+
+  switch (id) {
+    case -1: return KIT_ERROR_FORK_FAILED;
+
+    case 0:
+      //  Child process
+      //
+
+      p->status            = KIT_OK;
+      p->current_is_forked = 1;
+
+      if ((info.flags & KIT_PROCESS_NO_PIPES) == 0) {
+        //  Redirect IO
+        if (dup2(pipe_in[0], STDIN_FILENO) == -1 ||
+            dup2(pipe_out[1], STDOUT_FILENO) == -1 ||
+            dup2(pipe_err[1], STDERR_FILENO) == -1) {
+          assert(0);
+          close(pipe_in[0]);
+          close(pipe_in[1]);
+          close(pipe_out[0]);
+          close(pipe_out[1]);
+          close(pipe_err[0]);
+          close(pipe_err[1]);
+          return KIT_ERROR_DUP2_FAILED;
+        }
+
+        //  Close pipes
+        close(pipe_in[0]);
+        close(pipe_in[1]);
+        close(pipe_out[0]);
+        close(pipe_out[1]);
+        close(pipe_err[0]);
+        close(pipe_err[1]);
+      }
+
+      //  Change working directory
+      if (info.working_directory.size != 0 &&
+          chdir(kit_process_str_(info.working_directory)) == -1) {
+        assert(0);
+        return KIT_ERROR_CHDIR_FAILED;
+      }
+
+      if ((info.flags & KIT_PROCESS_FORK) == 0) {
+        execve(kit_process_str_(info.file_name),
+               kit_init_argv_(info.command_line, info.flags),
+               kit_init_envp_(info.environment, info.flags));
+        // Doesn't return on success
+
+        return KIT_ERROR_EXECVE_FAILED;
+      }
+
+      return KIT_OK;
+
+    default:
+      //  Parent process
+      //
+
+      p->status            = KIT_OK;
+      p->current_is_forked = 0;
+      p->_ready            = 1;
+      p->_running          = 1;
+      p->_id               = id;
+
+      if ((info.flags & KIT_PROCESS_NO_PIPES) == 0) {
+        p->_stdin  = pipe_in[1];
+        p->_stdout = pipe_out[0];
+        p->_stderr = pipe_err[0];
+
+        //  Close unused pipes
+        close(pipe_in[0]);
+        close(pipe_out[1]);
+        close(pipe_err[1]);
+      }
+  }
+
+  return KIT_OK;
+}
+
+void kit_process_cleanup(kit_process_t *p) {
+  assert(p != NULL);
+  assert(p->_ready);
+
+  if (p == NULL || !p->_ready)
+    return;
+
+  if (p->_stdin != -1)
+    close(p->_stdin);
+  if (p->_stdout != -1)
+    close(p->_stdout);
+  if (p->_stderr != -1)
+    close(p->_stderr);
+
+  memset(p, 0, sizeof *p);
+}
+
+i64 kit_process_write_stdin(kit_process_t *p, kit_str_t in_data) {
+  assert(p != NULL && (in_data.size == 0 || in_data.values != NULL) &&
+         p->_running);
+
+  if (p == NULL || (in_data.size != 0 && in_data.values == NULL))
+    return KIT_ERROR_INVALID_ARGUMENT;
+  if (in_data.size == 0 || !p->_running || p->_stdin == -1)
+    return 0;
+
+  i64 n = write(p->_stdin, in_data.values, in_data.size);
+
+  assert(n >= 0);
+  if (n < 0)
+    return 0;
+
+  return n;
+}
+
+i64 kit_process_read_stdout(kit_process_t *p, kit_str_t out_data) {
+  assert(p != NULL &&
+         (out_data.size == 0 || out_data.values != NULL) &&
+         p->_ready);
+
+  if (p == NULL || (out_data.size != 0 && out_data.values == NULL))
+    return KIT_ERROR_INVALID_ARGUMENT;
+  if (out_data.size == 0 || !p->_ready || p->_stdout == -1)
+    return 0;
+
+  i64 n = read(p->_stdout, out_data.values, out_data.size);
+
+  assert(n >= 0);
+  if (n < 0)
+    return 0;
+
+  return n;
+}
+
+i64 kit_process_read_stderr(kit_process_t *p, kit_str_t out_data) {
+  assert(p != NULL &&
+         (out_data.size == 0 || out_data.values != NULL) &&
+         p->_ready);
+
+  if (p == NULL || (out_data.size != 0 && out_data.values == NULL))
+    return KIT_ERROR_INVALID_ARGUMENT;
+  if (out_data.size == 0 || !p->_ready || p->_stderr == -1)
+    return 0;
+
+  i64 n = read(p->_stderr, out_data.values, out_data.size);
+
+  assert(n >= 0);
+  if (n < 0)
+    return 0;
+
+  return n;
+}
+
+s32 kit_process_terminate(kit_process_t *p) {
+  assert(p != NULL && p->_running);
+  if (p == NULL || !p->_running)
+    return KIT_ERROR_INVALID_ARGUMENT;
+
+  if (kill(p->_id, SIGTERM) == -1)
+    return KIT_ERROR_KILL_FAILED;
+
+  return KIT_OK;
+}
+
+b8 kit_process_alive(kit_process_t *p) {
+  assert(p != NULL);
+  if (p == NULL || p->status != KIT_OK)
+    return 0;
+
+  if (!p->_running)
+    return 0;
+
+  int status;
+
+  pid_t id = waitpid(p->_id, &status, WNOHANG);
+
+  if (id == -1) {
+    p->status = KIT_ERROR_WAITPID_FAILED;
+    return 0;
+  }
+
+  if (id == 0)
+    return 1;
+
+  if (WIFEXITED(status)) {
+    p->exit_code = WEXITSTATUS(status);
+    p->_running  = 0;
+    return 0;
+  }
+
+  return 1;
+}
+
+s32 kit_process_wait(kit_process_t *p) {
+  assert(p != NULL);
+  if (p == NULL)
+    return KIT_ERROR_INVALID_ARGUMENT;
+
+  if (p->status != KIT_OK)
+    return p->status;
+  if (!p->_running)
+    return KIT_OK;
+
+  for (;;) {
+    int status;
+
+    pid_t id = waitpid(p->_id, &status, 0);
+
+    if (id == -1)
+      return KIT_ERROR_WAITPID_FAILED;
+
+    if (WIFEXITED(status)) {
+      p->exit_code = WEXITSTATUS(status);
+      p->_running  = 0;
+      break;
+    }
+  }
+
+  return KIT_OK;
+}
+
+#endif