linux 底層檔案訪問(庫函數)

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write系統調用

#include<unistd.h>#include<stdlib.h>int main(){        if( (write(1,"here\n",6) !=6))        {                write(2,"WRONG",5);        }        exit(0);}

read系統調用

#include<unistd.h>#include<stdlib.h>int main(){        char buffer[128];        int nread;        nread = read(0,buffer,128);        if(-1 == nread)        {                write(2,"read WRONG",10);        }        if( ( write(1,buffer,nread) )!= nread )        {                write(2,"A write error",13);        }        exit(0);}

open 系統調用

#include<fcntl.h>#include<sys/types.h>#include<sys/stat.h>#include<unistd.h>#include<stdlib.h>int main(){        open("open.txt",O_CREAT,S_IRUSR|S_IXOTH);        exit(0);}

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