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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/os/job.h"
#include "nvim/os/job_defs.h"
#include "nvim/os/job_private.h"
#include "nvim/os/pty_process.h"
#include "nvim/memory.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "os/pty_process.c.generated.h"
#endif
typedef struct {
struct winsize winsize;
uv_pipe_t proc_stdin, proc_stdout, proc_stderr;
uv_signal_t schld;
int tty_fd;
} PtyProcess;
void pty_process_init(Job *job)
{
PtyProcess *ptyproc = xmalloc(sizeof(PtyProcess));
if (job->opts.writable) {
uv_pipe_init(uv_default_loop(), &ptyproc->proc_stdin, 0);
ptyproc->proc_stdin.data = NULL;
}
if (job->opts.stdout_cb) {
uv_pipe_init(uv_default_loop(), &ptyproc->proc_stdout, 0);
ptyproc->proc_stdout.data = NULL;
}
if (job->opts.stderr_cb) {
uv_pipe_init(uv_default_loop(), &ptyproc->proc_stderr, 0);
ptyproc->proc_stderr.data = NULL;
}
job->proc_stdin = (uv_stream_t *)&ptyproc->proc_stdin;
job->proc_stdout = (uv_stream_t *)&ptyproc->proc_stdout;
job->proc_stderr = (uv_stream_t *)&ptyproc->proc_stderr;
job->process = ptyproc;
}
void pty_process_destroy(Job *job)
{
free(job->opts.term_name);
free(job->process);
job->process = NULL;
}
bool pty_process_spawn(Job *job)
{
int master;
PtyProcess *ptyproc = job->process;
ptyproc->winsize = (struct winsize){job->opts.height, job->opts.width, 0, 0};
struct termios termios;
init_termios(&termios);
uv_disable_stdio_inheritance();
int pid = forkpty(&master, NULL, &termios, &ptyproc->winsize);
if (pid < 0) {
return false;
} else if (pid == 0) {
init_child(job);
abort();
}
// make sure the master file descriptor is non blocking
fcntl(master, F_SETFL, fcntl(master, F_GETFL) | O_NONBLOCK);
if (job->opts.writable) {
uv_pipe_open(&ptyproc->proc_stdin, dup(master));
}
if (job->opts.stdout_cb) {
uv_pipe_open(&ptyproc->proc_stdout, dup(master));
}
if (job->opts.stderr_cb) {
uv_pipe_open(&ptyproc->proc_stderr, dup(master));
}
uv_signal_init(uv_default_loop(), &ptyproc->schld);
uv_signal_start(&ptyproc->schld, chld_handler, SIGCHLD);
ptyproc->schld.data = job;
ptyproc->tty_fd = master;
job->pid = pid;
return true;
}
void pty_process_close(Job *job)
{
PtyProcess *ptyproc = job->process;
uv_signal_stop(&ptyproc->schld);
uv_close((uv_handle_t *)&ptyproc->schld, NULL);
job_close_streams(job);
job_decref(job);
}
void pty_process_resize(Job *job, uint16_t width, uint16_t height)
{
PtyProcess *ptyproc = job->process;
ptyproc->winsize = (struct winsize){height, width, 0, 0};
ioctl(ptyproc->tty_fd, TIOCSWINSZ, &ptyproc->winsize);
}
static void init_child(Job *job)
{
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", job->opts.term_name ? job->opts.term_name : "ansi", 1);
execvp(job->opts.argv[0], job->opts.argv);
fprintf(stderr, "execvp failed: %s\n", strerror(errno));
}
static void chld_handler(uv_signal_t *handle, int signum)
{
Job *job = handle->data;
int stat = 0;
if (waitpid(job->pid, &stat, 0) < 0) {
fprintf(stderr, "Waiting for pid %d failed: %s\n", job->pid,
strerror(errno));
return;
}
if (WIFSTOPPED(stat) || WIFCONTINUED(stat)) {
// Did not exit
return;
}
if (WIFEXITED(stat)) {
job->status = WEXITSTATUS(stat);
} else if (WIFSIGNALED(stat)) {
job->status = WTERMSIG(stat);
}
pty_process_close(job);
}
static void init_termios(struct termios *termios)
{
memset(termios, 0, sizeof(struct termios));
// Taken from pangoterm
termios->c_iflag = ICRNL|IXON;
termios->c_oflag = OPOST|ONLCR|TAB0;
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;
}
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