/ **************************************************************** * * Purpose: Basic example of pipe. * Read and write variable length records across a pipe. * * Author: M J Leslie * * Date: 17 Apr 96 * ****************************************************************/ #include <sys/types.h> #include <unistd.h> /* pipe. */ #include <signal.h> void Child (pid_t Handle); void Parent (pid_t Handle); main() { pid_t Pid; int fd[2]; pipe(fd); /* Create two file descriptors */ Pid = fork(); if ( Pid == 0) /* Child */ { close(fd[0]); Child(fd[1]); puts("Child end"); } else /* Parent */ { close(fd[1]); Parent(fd[0]); puts("Parent end"); } } /**************************************************************** * * The Child sends data to the parent. * ****************************************************************/ void Child(pid_t Handle) { int Len; char Buff[50]="Bass Beer"; Len = strlen(Buff)+1; write(Handle, &Len, sizeof(Len)); write(Handle, Buff, Len); strcpy(Buff, "Wild times."); Len = strlen(Buff)+1; write(Handle, &Len, sizeof(Len)); write(Handle, Buff, Len); strcpy(Buff, "Alex was ere."); Len = strlen(Buff)+1; write(Handle, &Len, sizeof(Len)); write(Handle, Buff, Len); strcpy(Buff, "Bon Jovi rules the world."); Len = strlen(Buff)+1; write(Handle, &Len, sizeof(Len)); write(Handle, Buff, Len); close(Handle); } /**************************************************************** * * Read the data sent by the child. * ****************************************************************/ void Parent(pid_t Handle) { int Len; char Buff[50]; /* ... Perform two reads. THe first gets the length of the data ... the second gets the actual data. */ while (read(Handle, &Len, sizeof(Len)) > 0) { read(Handle,Buff, Len); printf("%s\n", Buff); } }
file: /Techref/language/ccpp/cref/EXAMPLES/pipe2.c, 1KB, , updated: 1997/4/21 08:52, local time: 2024/12/23 08:18,
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