ASR31-valarche-2021/Exemples/06-Tubes2/exTube.c

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2021-10-13 08:43:24 +02:00
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
int tube[2], fcntlLecture, fcntlEcriture;
char buf[10];
struct stat statLecture, statEcriture;
void noeud (struct stat *statDesc) {
printf("Quelques caractérisitques du noeud\n");
if (S_ISFIFO(statDesc->st_mode)) printf("\t Type : tube\n");
else printf("\t Type : autre que tube\n");
printf("\t Numéro : %llu\n", statDesc-> st_ino);
printf("\t Numéro de disque : %d\n", statDesc-> st_dev);
printf("\t Numéro de liens physiques : %d\n", statDesc-> st_nlink);
printf("\t Taille : %lld\n", statDesc-> st_size);
}
main() {
if (pipe(tube) == -1) { perror("Création ratée"), exit(2); }
if ((fcntlLecture = fcntl(tube[0], F_GETFL)) == -1) {
perror("Fcntl lecture "); exit(2); }
if ((fcntlEcriture = fcntl(tube[1], F_GETFL)) == -1) {
perror("Fcntl ecriture "); exit(2); }
printf("Attributs de %d (tube[0]) : %d\n", tube[0], fcntlLecture);
printf("Attributs de %d (tube[1]) : %d\n", tube[1], fcntlEcriture);
write(tube[1], "0123456789", 10);
read(tube[0], buf, 5);
printf("Chaine lue : %s\n", buf);
fstat(tube[0], &statLecture);
fstat(tube[1], &statEcriture);
if (memcmp(&statLecture, &statEcriture, sizeof(struct stat)) != 0) {
fprintf(stderr, "Noeuds en lecture et écriture différents\n");
printf("Descripteur en lecture\n"); noeud(&statLecture);
printf("Descripteur en ecriture\n"); noeud(&statEcriture);
} else {
printf("Noeud en lecture et ecriture identique\n");
noeud(&statEcriture); }
}