学步园

#include <stdio.h><br /> #include <unistd.h><br /> #include <sys/stat.h><br /> #include <sys/types.h><br /> #include <fcntl.h></p> <p>int main()<br /> {<br /> int fid=open("text",O_RDWR|O_CREAT);<br /> printf("fid:%d/n",fid);<br /> //write sth.<br /> char data[]="abcdefg";<br /> int size=write(fid,data,sizeof(data));<br /> printf("size:%d/n",size);<br /> //<br /> char output[20];<br /> lseek(fid,0,SEEK_SET);<br /> int rSize=read(fid,output,20);<br /> printf("rSize:%d/n",rSize);<br /> printf("readData:%s/n",output);<br /> close(fid);<br /> return 0;<br /> }<br />

gcc -o fileIO fileIO.c

sudo ./fileIO

fid:3
size:8
rSize:8
readData:abcdefg

标准输入输出(终端)

#include <stdio.h><br /> #include <unistd.h><br /> #include <sys/stat.h><br /> #include <sys/types.h><br /> #include <fcntl.h></p> <p>int main()<br /> {<br /> char hint[]="input a word/n";<br /> write(1,hint,sizeof(hint));<br /> //<br /> char output[20];<br /> int rSize=read(0,output,20);<br /> //<br /> char hint2[]="your input:";<br /> write(1,hint2,sizeof(hint2));<br /> write(1,output,rSize);<br /> write(1,"/n",1);<br /> //<br /> return 0;<br /> }<br />

gcc -o stdIO stdIO.c

 ./stdIO
input a word
china
size:6
your input:china