pty_process: split into plat-specific files (#3976)

src/nvim/os/pty_process_unix.c

@@ -0,0 +1,239 @@
+// Some of the code came from pangoterm and libuv
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <unistd.h>
+#include <termios.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/ioctl.h>
+
+// forkpty is not in POSIX, so headers are platform-specific
+#if defined(__FreeBSD__)
+# include <libutil.h>
+#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
+# include <util.h>
+#else
+# include <pty.h>
+#endif
+
+#include <uv.h>
+
+#include "nvim/lib/klist.h"
+
+#include "nvim/event/loop.h"
+#include "nvim/event/rstream.h"
+#include "nvim/event/wstream.h"
+#include "nvim/event/process.h"
+#include "nvim/os/pty_process_unix.h"
+#include "nvim/log.h"
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "os/pty_process_unix.c.generated.h"
+#endif
+
+bool pty_process_spawn(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  static struct termios termios;
+  if (!termios.c_cflag) {
+    init_termios(&termios);
+  }
+
+  Process *proc = (Process *)ptyproc;
+  assert(!proc->err);
+  uv_signal_start(&proc->loop->children_watcher, chld_handler, SIGCHLD);
+  ptyproc->winsize = (struct winsize){ ptyproc->height, ptyproc->width, 0, 0 };
+  uv_disable_stdio_inheritance();
+  int master;
+  int pid = forkpty(&master, NULL, &termios, &ptyproc->winsize);
+
+  if (pid < 0) {
+    ELOG("forkpty failed: %s", strerror(errno));
+    return false;
+  } else if (pid == 0) {
+    init_child(ptyproc);
+    abort();
+  }
+
+  // make sure the master file descriptor is non blocking
+  int master_status_flags = fcntl(master, F_GETFL);
+  if (master_status_flags == -1) {
+    ELOG("Failed to get master descriptor status flags: %s", strerror(errno));
+    goto error;
+  }
+  if (fcntl(master, F_SETFL, master_status_flags | O_NONBLOCK) == -1) {
+    ELOG("Failed to make master descriptor non-blocking: %s", strerror(errno));
+    goto error;
+  }
+
+  if (proc->in && !set_duplicating_descriptor(master, &proc->in->uv.pipe)) {
+    goto error;
+  }
+  if (proc->out && !set_duplicating_descriptor(master, &proc->out->uv.pipe)) {
+    goto error;
+  }
+
+  ptyproc->tty_fd = master;
+  proc->pid = pid;
+  return true;
+
+error:
+  close(master);
+  kill(pid, SIGKILL);
+  waitpid(pid, NULL, 0);
+  return false;
+}
+
+void pty_process_resize(PtyProcess *ptyproc, uint16_t width, uint16_t height)
+  FUNC_ATTR_NONNULL_ALL
+{
+  ptyproc->winsize = (struct winsize){ height, width, 0, 0 };
+  ioctl(ptyproc->tty_fd, TIOCSWINSZ, &ptyproc->winsize);
+}
+
+void pty_process_close(PtyProcess *ptyproc)
+  FUNC_ATTR_NONNULL_ALL
+{
+  pty_process_close_master(ptyproc);
+  Process *proc = (Process *)ptyproc;
+  if (proc->internal_close_cb) {
+    proc->internal_close_cb(proc);
+  }
+}
+
+void pty_process_close_master(PtyProcess *ptyproc) FUNC_ATTR_NONNULL_ALL
+{
+  if (ptyproc->tty_fd >= 0) {
+    close(ptyproc->tty_fd);
+    ptyproc->tty_fd = -1;
+  }
+}
+
+void pty_process_teardown(Loop *loop)
+{
+  uv_signal_stop(&loop->children_watcher);
+}
+
+static void init_child(PtyProcess *ptyproc) FUNC_ATTR_NONNULL_ALL
+{
+  unsetenv("COLUMNS");
+  unsetenv("LINES");
+  unsetenv("TERMCAP");
+  unsetenv("COLORTERM");
+  unsetenv("COLORFGBG");
+
+  signal(SIGCHLD, SIG_DFL);
+  signal(SIGHUP, SIG_DFL);
+  signal(SIGINT, SIG_DFL);
+  signal(SIGQUIT, SIG_DFL);
+  signal(SIGTERM, SIG_DFL);
+  signal(SIGALRM, SIG_DFL);
+
+  setenv("TERM", ptyproc->term_name ? ptyproc->term_name : "ansi", 1);
+  execvp(ptyproc->process.argv[0], ptyproc->process.argv);
+  fprintf(stderr, "execvp failed: %s\n", strerror(errno));
+}
+
+static void init_termios(struct termios *termios) FUNC_ATTR_NONNULL_ALL
+{
+  // Taken from pangoterm
+  termios->c_iflag = ICRNL|IXON;
+  termios->c_oflag = OPOST|ONLCR;
+#ifdef TAB0
+  termios->c_oflag |= TAB0;
+#endif
+  termios->c_cflag = CS8|CREAD;
+  termios->c_lflag = ISIG|ICANON|IEXTEN|ECHO|ECHOE|ECHOK;
+
+  cfsetspeed(termios, 38400);
+
+#ifdef IUTF8
+  termios->c_iflag |= IUTF8;
+#endif
+#ifdef NL0
+  termios->c_oflag |= NL0;
+#endif
+#ifdef CR0
+  termios->c_oflag |= CR0;
+#endif
+#ifdef BS0
+  termios->c_oflag |= BS0;
+#endif
+#ifdef VT0
+  termios->c_oflag |= VT0;
+#endif
+#ifdef FF0
+  termios->c_oflag |= FF0;
+#endif
+#ifdef ECHOCTL
+  termios->c_lflag |= ECHOCTL;
+#endif
+#ifdef ECHOKE
+  termios->c_lflag |= ECHOKE;
+#endif
+
+  termios->c_cc[VINTR]    = 0x1f & 'C';
+  termios->c_cc[VQUIT]    = 0x1f & '\\';
+  termios->c_cc[VERASE]   = 0x7f;
+  termios->c_cc[VKILL]    = 0x1f & 'U';
+  termios->c_cc[VEOF]     = 0x1f & 'D';
+  termios->c_cc[VEOL]     = _POSIX_VDISABLE;
+  termios->c_cc[VEOL2]    = _POSIX_VDISABLE;
+  termios->c_cc[VSTART]   = 0x1f & 'Q';
+  termios->c_cc[VSTOP]    = 0x1f & 'S';
+  termios->c_cc[VSUSP]    = 0x1f & 'Z';
+  termios->c_cc[VREPRINT] = 0x1f & 'R';
+  termios->c_cc[VWERASE]  = 0x1f & 'W';
+  termios->c_cc[VLNEXT]   = 0x1f & 'V';
+  termios->c_cc[VMIN]     = 1;
+  termios->c_cc[VTIME]    = 0;
+}
+
+static bool set_duplicating_descriptor(int fd, uv_pipe_t *pipe)
+  FUNC_ATTR_NONNULL_ALL
+{
+  int fd_dup = dup(fd);
+  if (fd_dup < 0) {
+    ELOG("Failed to dup descriptor %d: %s", fd, strerror(errno));
+    return false;
+  }
+  int uv_result = uv_pipe_open(pipe, fd_dup);
+  if (uv_result) {
+    ELOG("Failed to set pipe to descriptor %d: %s",
+         fd_dup, uv_strerror(uv_result));
+    close(fd_dup);
+    return false;
+  }
+  return true;
+}
+
+static void chld_handler(uv_signal_t *handle, int signum)
+{
+  int stat = 0;
+  int pid;
+
+  do {
+    pid = waitpid(-1, &stat, WNOHANG);
+  } while (pid < 0 && errno == EINTR);
+
+  if (pid <= 0) {
+    return;
+  }
+
+  Loop *loop = handle->loop->data;
+
+  kl_iter(WatcherPtr, loop->children, current) {
+    Process *proc = (*current)->data;
+    if (proc->pid == pid) {
+      if (WIFEXITED(stat)) {
+        proc->status = WEXITSTATUS(stat);
+      } else if (WIFSIGNALED(stat)) {
+        proc->status = WTERMSIG(stat);
+      }
+      proc->internal_exit_cb(proc);
+      break;
+    }
+  }
+}