linux的c方式獲取shell結果

使用popen

test.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int cmd_run(char *cmd, char* results, int len)
{
        FILE *fp;
        char *buf;
        int totolen = 0;

        printf("run_cmd: [%s]\n", cmd);
        if ((fp = popen(cmd, "r")) == NULL) {
                printf("NMPPROTDATA_LOG: Fail to popen %s\n", cmd);
                return -1;
        }
        buf = (char *)calloc(1, len);
        if (buf == NULL)
        {
                pclose(fp);
                printf("NMPPROTDATA_LOG: Fail to alloc buffer %d\n", len);
                return -1;
        }
        while (fgets(buf, (len - totolen), fp) != NULL) {
                strcpy(results + totolen, buf);
                totolen += strlen(buf);
                memset(buf, 0, len);
        }

        pclose(fp);
        free(buf);
        //printf("results: [%s]\n", results);

        return 0;
}



int main(void) {
	int ret_val = -1;
	char buf[512] = {0};
	char cmd[512] = {0};
	printf("start\n");
	
	
	sprintf(cmd, "pwd");
	ret_val = cmd_run(cmd, buf, sizeof(buf));
	if(ret_val < 0) {
		printf("execute fail\n");
	} else {
		printf("result:%s\n", buf);	
	}
}