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* This code is in the public domain; do with it what you wish.
* Written by Karel Zak <kzak@redhat.com> in Jul 2019
#include <pty.h>
#include <termios.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/signalfd.h>
* Callbacks -- the first argument is always callback data, see
* ul_pty_set_callback_data().
struct ul_pty_callbacks {
* Optional. Executed on SIGCHLD when ssi_code is EXITED, KILLED or
* DUMPED; The callback has to call ul_pty_set_child(pty, (pid_t) -1)
* if child is no more alive.
void (*child_wait)(void *, pid_t);
* Used when child_wait() undefined to informa about child status
void (*child_die)(void *, pid_t, int);
* Executed on SIGCHLD when ssi_status is SIGSTOP
void (*child_sigstop)(void *, pid_t);
* Executed in master loop before ul_pty enter poll() and in time set by
* ul_pty_set_mainloop_time(). The callback is no used when time is not set.
int (*mainloop)(void *);
* Executed on master or stdin activity, arguments:
* 2nd - file descriptor
* 3rd - buffer with data
* 4th - size of the data
int (*log_stream_activity)(void *, int, char *, size_t);
* Executed on signal, arguments:
* 2nd - signal info
* 3rd - NULL or signal specific data (e.g. struct winsize on SIGWINCH
int (*log_signal)(void *, struct signalfd_siginfo *, void *);
* Executed on SIGUSR1
int (*flush_logs)(void *);
struct ul_pty {
struct termios stdin_attrs; /* stdin and slave terminal runtime attributes */
int master; /* parent side */
int slave; /* child side */
int sigfd; /* signalfd() */
int poll_timeout;
struct winsize win; /* terminal window size */
sigset_t orgsig; /* original signal mask */
int delivered_signal;
struct ul_pty_callbacks callbacks;
void *callback_data;
pid_t child;
struct timeval next_callback_time;
struct ul_pty_child_buffer {
struct ul_pty_child_buffer *next;
char buf[BUFSIZ];
size_t size, cursor;
unsigned int final_input:1; /* drain child before writing */
} *child_buffer_head, *child_buffer_tail, *free_buffers;
unsigned int isterm:1, /* is stdin terminal? */
slave_echo:1; /* keep ECHO on pty slave */
void ul_pty_init_debug(int mask);
struct ul_pty *ul_new_pty(int is_stdin_tty);
void ul_free_pty(struct ul_pty *pty);
void ul_pty_slave_echo(struct ul_pty *pty, int enable);
int ul_pty_get_delivered_signal(struct ul_pty *pty);
void ul_pty_set_callback_data(struct ul_pty *pty, void *data);
void ul_pty_set_child(struct ul_pty *pty, pid_t child);
struct ul_pty_callbacks *ul_pty_get_callbacks(struct ul_pty *pty);
int ul_pty_is_running(struct ul_pty *pty);
int ul_pty_setup(struct ul_pty *pty);
void ul_pty_cleanup(struct ul_pty *pty);
int ul_pty_chownmod_slave(struct ul_pty *pty, uid_t uid, gid_t gid, mode_t mode);
void ul_pty_init_slave(struct ul_pty *pty);
int ul_pty_proxy_master(struct ul_pty *pty);
void ul_pty_set_mainloop_time(struct ul_pty *pty, struct timeval *tv);
int ul_pty_get_childfd(struct ul_pty *pty);
void ul_pty_wait_for_child(struct ul_pty *pty);
pid_t ul_pty_get_child(struct ul_pty *pty);
void ul_pty_write_eof_to_child(struct ul_pty *pty);
#endif /* UTIL_LINUX_PTY_H */