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feat(signal): change the behaviour of SIGINT

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In previous versions, when a SIGINT was received, the program would exit
if there were no child processes, now the behavior is changed to not
exit and start a new line.
This commit is contained in:
iridiumR 2022-09-20 22:29:59 +08:00
parent 87eb989d79
commit f99caf42f3
No known key found for this signature in database
GPG key ID: 5574BE4450D55618
4 changed files with 21 additions and 22 deletions
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6
exec.c
View file

@ -2,7 +2,7 @@
* @Author: 1ridic
* @Date: 2022-09-18 14:14:23
* @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 23:31:39
* @Last Modified time: 2022-09-20 22:24:51
*/
#include "builtin.h"
#include <stdio.h>
@ -31,17 +31,13 @@ int forkExec(char **args) {
/* fork error */
perror("dish");
} else {
extern char volatile isWaiting;
isWaiting = 1;
/* parent process: wait child process*/
int stat_val;
waitpid(pid, &stat_val, 0);
if (WIFEXITED(stat_val)) {
isWaiting = 0;
return WEXITSTATUS(stat_val);
}
else if (WIFSIGNALED(stat_val)) {
isWaiting = 1;
return WTERMSIG(stat_val);
}
}

16
loop.c
View file

@ -2,7 +2,7 @@
* @Author: 1ridic
* @Date: 2022-09-18 14:13:53
* @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 23:32:02
* @Last Modified time: 2022-09-20 22:26:59
*/
#include <stdio.h>
#include <readline/readline.h>
@ -15,6 +15,20 @@
int status;
void SIGINT_Handler(int dummy) {
#ifdef DEBUG
fprintf(stdout,"\ndebug: SIGINT\n");
#endif
/* Move to a new line */
fprintf(stdout,"\n");
/* Regenerate the prompt on a newline */
rl_on_new_line();
/* Clear the previous text */
rl_replace_line("", 0);
rl_redisplay();
return;
}
int loop() {
char *line;

3
loop.h
View file

@ -2,10 +2,11 @@
* @Author: 1ridic
* @Date: 2022-09-18 14:14:19
* @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 14:14:19
* @Last Modified time: 2022-09-20 22:24:24
*/
#ifndef _LOOP_H_
#define _LOOP_H_
#include "config.h"
void SIGINT_Handler(int dummy);
int loop();
#endif

16
main.c
View file

@ -2,7 +2,7 @@
* @Author: 1ridic
* @Date: 2022-09-18 14:13:59
* @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 23:21:37
* @Last Modified time: 2022-09-20 22:23:59
*/
#include <signal.h>
#include <stdio.h>
@ -11,22 +11,10 @@
#include <string.h>
#include "loop.h"
char volatile isWaiting = 0;
void intHandler(int dummy) {
#ifdef DEBUG
fprintf(stdout,"\ndebug: enter soft-irq. isWaiting=%d\n",isWaiting);
#endif
if (isWaiting==1) {
return;
}
fprintf(stderr,"\nSIGINT exit.\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) {
/* soft irq */
signal(SIGINT, intHandler);
signal(SIGINT, SIGINT_Handler);
/* clear screen */
fprintf(stdout,"\033[H\033[J");
#ifdef DEBUG