dish/exec.c

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/*
* @Author: 1ridic
* @Date: 2022-09-18 14:14:23
* @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 14:44:37
*/
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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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#include "builtin.h"
extern int (*builtin_func[]) (char **);
extern char* builtin_cmd[];
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int forkExec(char **args) {
pid_t pid;
int status;
#ifdef DEBUG
printf("debug: fork enter.\n");
#endif
pid = fork();
if (pid == 0) {
/* child process */
if (execvp(args[0], args) == -1) {
perror("dish");
exit(EXIT_FAILURE);
}
} else if (pid < 0) {
/* fork error */
perror("dish");
} else {
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extern char volatile isWaiting;
isWaiting = 1;
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/* parent process: wait child process*/
pid=wait(&status);
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isWaiting = 0;
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}
return WEXITSTATUS(status);
}
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int commandExec(char **args) {
int i;
if (args[0] == NULL) {
/* empty command */
return 1;
}
for (i = 0; i < getBuiltinNum(); i++) {
if (strcmp(args[0], builtin_cmd[i]) == 0) {
return (*builtin_func[i])(args);
}
}
return forkExec(args);
}