[mirrors/Programs.git] / c / mmap / mmap.c

//#define _GNU_SOURCE

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define MEM_PATH "hello.bin"
#define MEM_SIZE 1048576

int main() {
	int fd;
	fd = open(MEM_PATH, O_RDWR | O_SYNC | O_CREAT | O_CLOEXEC, S_IRUSR | S_IWUSR);
	ftruncate(fd, MEM_SIZE);

	void *mem;
	mem = mmap(NULL, MEM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED , fd, 0);
	close(fd);

	char hello[] = "Hello!";
	memcpy(mem, hello, sizeof(hello));
	msync(mem, sizeof(hello), MS_SYNC);
}
Commit	Line	Data
b4d0545c TM	1	//#define _GNU_SOURCE
b4d0545c TM	2
21c4e167	3	#include <stdio.h>
21c4e167	4	#include <sys/types.h>
b4d0545c TM	5	#include <sys/stat.h>
	6	#include <sys/mman.h>
	7	#include <fcntl.h>
	8	#include <unistd.h>
	9	#include <string.h>
21c4e167	10
b4d0545c TM	11	#define MEM_PATH "hello.bin"
b4d0545c TM	12	#define MEM_SIZE 1048576
21c4e167 H	13
21c4e167 H	14	int main() {
b4d0545c TM	15	int fd;
	16	fd = open(MEM_PATH, O_RDWR \| O_SYNC \| O_CREAT \| O_CLOEXEC, S_IRUSR \| S_IWUSR);
	17	ftruncate(fd, MEM_SIZE);
21c4e167	18
b4d0545c TM	19	void *mem;
	20	mem = mmap(NULL, MEM_SIZE, PROT_READ \| PROT_WRITE, MAP_SHARED , fd, 0);
	21	close(fd);
21c4e167	22
b4d0545c TM	23	char hello[] = "Hello!";
	24	memcpy(mem, hello, sizeof(hello));
	25	msync(mem, sizeof(hello), MS_SYNC);
21c4e167	26	}