上午沒有上課調到了晚上，今天心情有點陰暗，linux中目錄的東西沒有聽懂，上課的時候抑制不住的困，下午講了dup 、getcwd 、chdir、stat目錄（沒聽懂），晚上講的管道，都聽懂了，並且親自動手碼了一遍，成功。現將今天學的代碼貼一下：
1、getcwd（）
/*************************************************************************
> File Name: my_cwd.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 03:43:26 PM CST
************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
int main(int argc, char* argv[])
{
char* pdir = getcwd(NULL, 0);
printf("cwd1: %s\n", pdir);
chdir("/home/comst");
pdir = getcwd(NULL, 0);
printf("cwd2: %s\n", pdir);
while(1);
return 0 ;
}
2、Dup
/*************************************************************************
> File Name: my_dup.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 03:01:40 PM CST
************************************************************************/
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<fcntl.h>
#include<unistd.h>
int main(int argc, char* argv[])
{
char* p = "hello world! \n" ;
int fd = open(argv[1], O_WRONLY | O_CREAT, 0666);
dup2(fd, 1);
close(fd);
read(0);
write(1 , p, strlen(p));
return 0 ;
}
3、chdir（）
/*************************************************************************
> File Name: my_rdir.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 03:56:59 PM CST
************************************************************************/
#include<stdio.h>
#include<sys/types.h>
#include<dirent.h>
#include<stdlib.h>
int main(int argc, char* argv[])
{
DIR* fp_dir ;
struct dirent* pent ;
//chdir("..");
fp_dir = opendir(argv[1]);
if(fp_dir == NULL)
{
perror("open");
exit(1);
}
printf("OK!\n");
while((pent = readdir(fp_dir)) != NULL )
{
printf("ino: %u\noff_t:%u\nreclen:%u\nname: %s\ntype:%x\n" ,pent ->d_ino,pent ->d_off,pent ->d_reclen, pent ->d_name, pent ->d_type );
printf("--------------------------------\n");
}
closedir(fp_dir);
return 0 ;
}
4、ls -l
//ls.h
#ifndef MY_LS
#define MY_LS
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<grp.h>
#include<pwd.h>
#include<time.h>
#include<dirent.h>
void show_info(char* path);
#endif
//ls.c
/*************************************************************************
> File Name: my_ls.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 05:03:33 PM CST
************************************************************************/
#include"my_ls.h"
int main(int argc, char* argv[])
{
DIR* fp_dir ;
struct dirent* pent ;
fp_dir = opendir(argv[1]);
if(fp_dir == NULL)
{
perror("open");
exit(1);
}
printf("OK!\n");
while((pent = readdir(fp_dir)) != NULL )
{
show_info(pent ->d_name);
}
closedir(fp_dir);
return 0 ;
}
//show_info
/*************************************************************************
> File Name: show_info.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 05:08:19 PM CST
************************************************************************/
#include"my_ls.h"
static void mode_to_str(mode_t md, char* buf) ;
static char* time_handle(char* pt);
void show_info(char* path)
{
struct stat my_stat ;
char buf[11] ;
memset(&my_stat, 0, sizeof(my_stat));
if(-1 == stat(path, &my_stat))
{
perror("stat");
exit(1);
}
mode_to_str(my_stat.st_mode, buf);
printf("%s.%3d%8s%8s%5d %s %s\n", buf, my_stat.st_nlink, getpwuid(my_stat.st_uid) ->pw_name, getgrgid(my_stat.st_gid) -> gr_name, my_stat.st_size, time_handle( ctime(&my_stat.st_mtime) ), path);
}
static void mode_to_str(mode_t md, char* buf)
{
if(S_ISREG(md))
{
buf[0] ='-' ;
}else if(S_ISDIR(md))
{
buf[0] ='d';
}else if(S_ISCHR(md))
{
buf[0] = 'c' ;
}else if(S_ISBLK(md))
{
buf[0]='b';
}else if(S_ISFIFO(md))
{
buf[0] = 'p';
}else if(S_ISLNK(md))
{
buf[0] = 'l' ;
}else
{
buf[0] = 's' ;
}
if(md & S_IRUSR)
{
buf[1] = 'r' ;
}else
{
buf[1] = '-' ;
}
if(md & S_IWUSR)
{
buf[2] = 'w' ;
}else
{
buf[2] = '-' ;
}
if(md & S_IXUSR)
{
buf[3] = 'x' ;
}else
{
buf[3] = '-' ;
}
if(md & S_IRGRP)
{
buf[4] = 'r' ;
}else
{
buf[4] = '-' ;
}
if(md & S_IWGRP)
{
buf[5] = 'w' ;
}else
{
buf[5] = '-' ;
}
if(md & S_IXGRP)
{
buf[6] = 'x' ;
}else
{
buf[6] = '-' ;
}
if(md & S_IROTH)
{
buf[7] = 'r' ;
}else
{
buf[7] = '-' ;
}
if(md & S_IWOTH)
{
buf[8] = 'w' ;
}else
{
buf[8] = '-' ;
}
if(md & S_IXOTH)
{
buf[9] = 'x' ;
}else
{
buf[9] = '-' ;
}
buf[10] = 0;
}
static char* time_handle(char* pt)
{
pt[strlen(pt) - 1] = 0 ;
return pt + 4 ;
}
5、管道通信 cl1發 cl2 收 cl2 發 cl1收
/*************************************************************************
> File Name: cl1.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 08:22:04 PM CST
************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
int main(int argc, char* argv[])//cl1->cl2 cl2->cl1
{
int fd_recv = open(argv[2], O_RDONLY);
int fd_send = open(argv[1], O_WRONLY);
if(fd_send == -1 || fd_recv == -1)
{
perror("open");
exit(1);
}
printf("OK!\n");
char buf[1024] ;
while(memset(buf, 0, 1024), read(0, buf, 1024) != 0)
{
write(fd_send, buf, strlen(buf));
memset(buf, 0, 1024);
read(fd_recv, buf, 1024);
printf("from cl2: %s\n", buf);
}
close(fd_send);
close(fd_recv);
return 0 ;
}
/*************************************************************************
> File Name: cl2.c
> Author: Comst
> Mail:[email protected]
> Created Time: Wed 28 Jan 2015 08:22:10 PM CST
************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
int main(int argc, char* argv[])//cl2 ->cl1 cl1 ->cl2
{
int fd_send = open(argv[1], O_WRONLY);
int fd_recv = open(argv[2], O_RDONLY);
if(fd_send == -1 || fd_recv == -1)
{
perror("open");
exit(1);
}
printf("OK!\n");
char buf[1024] ;
while(memset(buf, 0, 1024),read(fd_recv, buf, 1024) != 0)
{
printf("from cl1: %s\n", buf);
memset(buf, 0, 1024);
read(0, buf, 1024);
write(fd_send, buf, strlen(buf));
}
printf("cl1 exit!\n");
close(fd_send);
close(fd_recv);
return 0 ;
}