66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
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* @Author: 1ridic
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* @Date: 2022-09-18 14:14:23
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* @Last Modified by: 1ridic
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* @Last Modified time: 2022-09-18 23:31:39
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*/
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#include "builtin.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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extern int (*builtin_func[])(char **);
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extern char *builtin_cmd[];
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int forkExec(char **args) {
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pid_t pid;
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#ifdef DEBUG
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printf("debug: fork enter.\n");
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#endif
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pid = fork();
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if (pid == 0) {
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/* child process */
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if (execvp(args[0], args) == -1) {
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perror("dish");
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exit(EXIT_FAILURE);
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}
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} else if (pid < 0) {
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/* fork error */
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perror("dish");
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} else {
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extern char volatile isWaiting;
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isWaiting = 1;
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/* parent process: wait child process*/
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int stat_val;
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waitpid(pid, &stat_val, 0);
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if (WIFEXITED(stat_val)) {
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isWaiting = 0;
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return WEXITSTATUS(stat_val);
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}
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else if (WIFSIGNALED(stat_val)) {
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isWaiting = 1;
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return WTERMSIG(stat_val);
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}
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}
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return -100;
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}
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int commandExec(char **args) {
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int i;
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if (args[0] == NULL) {
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/* empty command */
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return 1;
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}
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for (i = 0; i < getBuiltinNum(); i++) {
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if (strcmp(args[0], builtin_cmd[i]) == 0) {
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return (*builtin_func[i])(args);
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}
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}
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return forkExec(args);
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}
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