First entry with IPC posix (shared memory)

C_Language/IPC_shm_posix.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <malloc.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+int main( int argc, char **argv)
+{
+	int fd;
+	int * compteur;
+
+	if(argc != 2)
+	{
+		fprintf(stderr, "Syntaxe : %s nom_segment\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+	if((fd = shm_open(argv[1], O_RDWR | O_CREAT, 0600)) == -1)
+	{
+		perror(argv[1]);
+		exit(EXIT_FAILURE);
+	}
+	if(ftruncate(fd, sizeof(int)) != 0)
+	{
+		perror("ftruncate");
+		exit(EXIT_FAILURE);
+	}
+	compteur = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+
+	if(compteur == MAP_FAILED)
+	{
+		perror("mmap");
+		exit(EXIT_FAILURE);
+	}
+	while(1)
+	{
+		(* compteur)++;
+		fprintf(stdout, "compteur = %d\n", (* compteur));
+		sleep(1);
+	}
+	return EXIT_SUCCESS;
+}
+