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#include <sys/mman.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <err.h> #include <stdlib.h> #define PAGE_SIZE 4096 #define STRING1 "Hello from first mapping!" #define STRING2 "Greetings from second mapping!" static void print_string_at(const char *addr) { printf("At address %p: \"%s\"\n", (const void *)addr, addr); } int main(void) { char *addr1, *addr2; char template[] = "/tmp/mmap_test.XXXXXX"; int fd, prot, flags; /* Create temporary file */ fd = mkstemp(template); if (fd == -1) err(1, "mkstemp failed"); /* Immediately unlink - file will persist until last fd is closed */ if (unlink(template) == -1) err(1, "unlink failed"); /* Extend file to page size */ if (ftruncate(fd, PAGE_SIZE) == -1) err(1, "ftruncate failed"); /* Set up protection and flags for mapping */ prot = PROT_READ | PROT_WRITE; flags = MAP_SHARED; /* Create first mapping */ addr1 = mmap(NULL, PAGE_SIZE, prot, flags, fd, 0); if (addr1 == MAP_FAILED) err(1, "First mmap failed"); /* Create second mapping of the same file */ addr2 = mmap(NULL, PAGE_SIZE, prot, flags, fd, 0); if (addr2 == MAP_FAILED) err(1, "Second mmap failed"); printf("Created two mappings of the same page:\n"); printf("addr1: %p\n", (void *)addr1); printf("addr2: %p\n", (void *)addr2); printf("\n"); /* Write to first mapping */ printf("Writing first string to addr1...\n"); strcpy(addr1, STRING1); print_string_at(addr1); print_string_at(addr2); printf("\n"); /* Write to second mapping */ printf("Writing second string to addr2...\n"); strcpy(addr2, STRING2); print_string_at(addr1); print_string_at(addr2); /* Clean up */ if (munmap(addr1, PAGE_SIZE) == -1) err(1, "munmap failed for addr1"); if (munmap(addr2, PAGE_SIZE) == -1) err(1, "munmap failed for addr2"); if (close(fd) == -1) err(1, "close failed"); return (0); }

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