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/*
* esh - the 'extensible' shell.
*
* Utility functions for system calls.
*
* Developed by Godmar Back for CS 3214 Fall 2009
* Virginia Tech.
*/
#include <stdbool.h>
#include <signal.h>
/* Print message to stderr, followed by information about current error.
* Use like 'printf' */
void esh_sys_error(char *fmt, ...);
void esh_sys_fatal_error(char *fmt, ...);
/* Get a file descriptor that refers to controlling terminal */
int esh_sys_tty_getfd(void);
/* Initialize tty support.
* Return pointer to static structure that saves initial state.
* Restore this state via esh_sys_tty_restore() whenever the shell
* takes back control of the terminal.
*/
struct termios * esh_sys_tty_init(void);
/* Save current terminal settings.
* This function is used when a job is suspended.*/
void esh_sys_tty_save(struct termios *saved_tty_state);
/* Restore terminal to saved settings.
* This function is used when resuming a suspended job. */
void esh_sys_tty_restore(struct termios *saved_tty_state);
/* Return true if this signal is blocked */
bool esh_signal_is_blocked(int sig);
/* Block a signal. Returns true it was blocked before */
bool esh_signal_block(int sig);
/* Unblock a signal. Returns true it was blocked before */
bool esh_signal_unblock(int sig);
/* Signal handler prototype */
typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
/* Install signal handler for signal 'sig' */
void esh_signal_sethandler(int sig, sa_sigaction_t handler);