linux读写操作

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>


static char *handle_name = "CPU num, cpu used, mem used, disk used\n";

char file_path[128] = {0};
    int ret = GetFileName(file_path,sizeof(file_path));
    if(ret < 0)
    {
        printf("<%s,%d> get filename err.\n", __func__, __LINE__);
        return -1;
    }
 
int fd = open(file_path, O_RDWR|O_CREAT);
 
write(fd, handle_name, strlen(handle_name));


sprintf(buf, "%d, %f4.2, %f4.2, %s\n",cpu_num, g_cpu_ysed, using, used);
write(fd, buf, strlen(buf));


int GetFileName(char *file_path,int max_path_len)
{
    int cnt = 0;
    system("mkdir -p /home/nvidia/cpu_info_log \n");
    while(1)
    {
        if(cnt > 10000)
        {
            printf("<%s,%d> Too many filepath \n", __func__, __LINE__);
            return -1;
        }
        memset(file_path, 0, sizeof(max_path_len));
        sprintf(file_path, "/home/nvidia/cpu_info_log/cpu_info_%d.csv", cnt++);
        if(0 == access(file_path, F_OK))
        {
            continue;
        } else {
            printf("<%s,%d> get filename[%s]\n", __func__, __LINE__, file_path);
            break;
        }   
    }
    return 0;
}


close(fd)