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// 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;
}
}
}
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