| 0,0 → 1,49 |
|---|
| /* |
| * 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); |