C Language for pipeline communication

MKFIFO.C file

1#include <sys/types.h>2#include <sys/stat.h>3#include <stdio.h>4#include <errno.h>5 6 intMain ()7 {8     //int Mkfifo (const char *pathname, mode_t mode);9 Ten     intRet=mkfifo ("./test",0777); One     if(ret<0) A     { -         if(errno==eexist) -         { theprintf"Create error errno=%d\n", errno); -             return-1; -         } -     } +}

Link.h file

1#include <stdio.h>2#include <stdlib.h>3#include <string.h>4#include <unistd.h>5typedefstructStudent6 {7     intID;8     Charname[ -];9     structStudent *Next;Ten}stu,*Pstu; One  A pstu Add_node (Pstu head); - voidShow_link (Pstu head); - voidWrite_link (Pstu Head,intFD); thePstu Read_link (intFD);

LINK.C file

1#include <stdio.h>2#include <stdlib.h>3#include <string.h>4#include"link.h"5 6 pstu Add_node (pstu head)7 {8Pstu temp= (PSTU)malloc(sizeof(STU));9printf"Please input ID:");Tenscanf"%d",&temp->ID); Oneprintf"Please input name:"); Ascanf"%s",temp->name); -temp->next=head; -     returntemp; the } -  - voidShow_link (pstu head) - { +printf"id\tname\n"); -      while(head!=NULL) +     { Aprintf"%d\t%s\n",head->id,head->name); atHead=head->Next; -     } - } -Pstu Read_link (intFD) - { -     intret; inPstu temp,head=NULL; -      while(1) to     { +temp= (PSTU)malloc(sizeof(STU)); -Ret=read (Fd,temp,sizeof(STU)); the         if(ret<0) *         { $printf"Read error\n");Panax Notoginseng             returnNULL; -         } the         Else if(ret==0) +             returnhead; A         Else the         { +temp->next=head; -Head=temp; $         } $     } - } - voidWrite_link (Pstu Head,intFD) the { -      while(head!=NULL)Wuyi     { theWrite (Fd,head,sizeof(STU)); -Head=head->Next; Wu     } -}

WRITE.C file

1#include <stdio.h>2#include <unistd.h>3#include <sys/types.h>4#include <sys/stat.h>5#include <fcntl.h>6#include <string.h>7#include"link.h"8 intMain ()9 {Ten     intFD; OneFd=open ("./test", o_wronly); A     if(fd<0) -     { -printf"Open filed\n"); the         return-1; -     } -Pstu head=NULL; -      for(intI=0;i<5; i++) +     { -Head=Add_node (head); +     } A Show_link (head); at  - Write_link (HEAD,FD); - Close (FD); -}

READ.C file

1#include <stdio.h>2#include <unistd.h>3#include <sys/types.h>4#include <sys/stat.h>5#include <fcntl.h>6#include"link.h"7 8 intMain ()9 {Ten     intFD; OneFd=open ("./test", o_rdonly); A     if(fd<0) -     { -printf"Open failed\n"); the         return-1; -     } -  -Pstu head=Read_link (FD); + Show_link (head); -  + Close (FD); A}

GCC mkfifo.c

./aou.t Generate Test

GCC link.c write.c-o Write

GCC link.c Read.c-o Read

Run read and write with effects such as:

C Language for pipeline communication