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#include <ctype.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
int pfd01[2], pfd10[2];
void erreur(char *message)
{
fprintf(stderr,"Erreur: %s\terrno=%d\n", message,errno);
exit(1);
}
void Pere()
{
int i;
char buffer[BUFSIZ]="bonjour";
char chaine[BUFSIZ];
if(close(pfd01[0])==-1) erreur("close");
if(close(pfd10[1])==-1) erreur("close");
if(write(pfd01[1], buffer, 7)==-1) erreur("write");
if(read(pfd10[0], chaine, 7)==-1) erreur("write");
for(i=0;i<7;i++)
{
printf("%c",chaine[i]);
}
}
void Fils()
{
char buffer[BUFSIZ];
int i;
if(close(pfd01[1])==-1) erreur("close");
if(close(pfd10[0])==-1) erreur("close");
if(read(pfd01[0], buffer, 7)==-1) erreur("write");
for(i=0;i<7;i++)
{
buffer[i]=toupper(buffer[i]);
}
if(write(pfd10[1], buffer, 7)==-1) erreur("write");
exit(0);
}
int main()
{
if(pipe(pfd01)==-1) erreur("pipe");
if(pipe(pfd10)==-1) erreur("pipe");
switch(fork())
{
case -1 : erreur("fork");
case 0 : fils();
}
pere();
} |
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