site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Terry et. al. @Apple: No forward looking statements, sorry. -- Terry -Jamil On Mar 11, 2008, at 1:47 PM, Terry Lambert wrote: -- Terry ---------------------------------------------------------------------------------------------------------- #include <stdio.h> #include <sys/mman.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include <sys/errno.h> #include <sys/types.h> #define MEMSIZE ((long)4*1024*1024*1024) int main (void) { int fd1, err; char *mem1; printf ("sizeof(void *) = %d\n", sizeof(void *)); printf ("sizeof(int) = %d\n", sizeof(int)); printf ("sizeof(long) = %d\n", sizeof(long)); printf ("memsize = %ld\n", MEMSIZE); err = shm_unlink ("bank1"); printf ("shm_unlink bank1 = %d\n", err); //exit (EXIT_SUCCESS); fd1 = shm_open ("bank1", O_RDWR|O_CREAT); printf ("fd1 = %d\n", fd1); err = ftruncate (fd1, MEMSIZE); printf ("ftruncate bank1 = %d\n", err); printf ("Error = %s\n", strerror(errno)); memset (mem1, 0xAA, MEMSIZE); } ---------------------------------------------------------------------------------------------------------- Output is: sizeof(void *) = 8 sizeof(int) = 4 sizeof(long) = 8 memsize = 4294967296 shm_unlink bank1 = 0 fd1 = 3 ftruncate bank1 = 0 mmap bank1 = 0xffffffffffffffff Error = Invalid argument Segmentation fault ---------------------------------------------------------------------------------------------------------- If I change MEMSIZE to ((long)3*1024*1024*1024) The Output is: sizeof(void *) = 8 sizeof(int) = 4 sizeof(long) = 8 memsize = 3221225472 shm_unlink bank1 = 0 fd1 = 3 ftruncate bank1 = 0 mmap bank1 = 0x101000000 Error = Unknown error: 0 ---------------------------------------------------------------------------------------------------------- Send Darwin-kernel mailing list submissions to darwin-kernel@lists.apple.com To subscribe or unsubscribe via the World Wide Web, visit http://lists.apple.com/mailman/listinfo/darwin-kernel or, via email, send a message with subject or body 'help' to darwin-kernel-request@lists.apple.com You can reach the person managing the list at darwin-kernel-owner@lists.apple.com When replying, please edit your Subject line so it is more specific than "Re: Contents of Darwin-kernel digest..." Today's Topics: 1. 64 bit development -- Is mmap() of over 4GB possible on OS X 10.4/10.5? (Jamil J. Weatherbee) 2. Re: 64 bit development -- Is mmap() of over 4GB possible on OS X 10.4/10.5? (William Kucharski) ---------------------------------------------------------------------- Gentlemen, compiled with "gcc -arch ppc64 -o openmem openmem.c" #include <stdio.h> #include <sys/mman.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include <sys/errno.h> #include <sys/types.h> #define MEMSIZE ((long)2*1024*1024*1024) int main (void) { int fd1, fd2, fd3, fd4, fd5, err; char *mem1, *mem2, *mem3, *mem4, *mem5; printf ("sizeof(void *) = %d\n", sizeof(void *)); printf ("sizeof(int) = %d\n", sizeof(int)); printf ("sizeof(long) = %d\n", sizeof(long)); printf ("memsize = %ld\n", MEMSIZE); err = shm_unlink ("bank1"); printf ("shm_unlink bank1 = %d\n", err); err = shm_unlink ("bank2"); printf ("shm_unlink bank2 = %d\n", err); err = shm_unlink ("bank3"); printf ("shm_unlink bank3 = %d\n", err); err = shm_unlink ("bank4"); printf ("shm_unlink bank4 = %d\n", err); err = shm_unlink ("bank5"); printf ("shm_unlink bank5 = %d\n", err); fd1 = shm_open ("bank1", O_RDWR|O_CREAT); printf ("fd1 = %d\n", fd1); fd2 = shm_open ("bank2", O_RDWR|O_CREAT); printf ("fd2 = %d\n", fd2); fd3 = shm_open ("bank3", O_RDWR|O_CREAT); printf ("fd3 = %d\n", fd3); fd4 = shm_open ("bank4", O_RDWR|O_CREAT); printf ("fd4 = %d\n", fd4); fd5 = shm_open ("bank5", O_RDWR|O_CREAT); printf ("fd5 = %d\n", fd5); err = ftruncate (fd1, MEMSIZE); printf ("ftruncate bank1 = %d\n", err); err = ftruncate (fd2, MEMSIZE); printf ("ftruncate bank2 = %d\n", err); err = ftruncate (fd3, MEMSIZE); printf ("ftruncate bank3 = %d\n", err); err = ftruncate (fd4, MEMSIZE); printf ("ftruncate bank4 = %d\n", err); err = ftruncate (fd5, MEMSIZE); printf ("ftruncate bank5 = %d\n", err); mem1 = mmap (NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd1, 0); printf ("mmap bank1 = %p\n", mem1); mem2 = mmap (NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd2, 0); printf ("mmap bank2 = %p\n", mem2); mem3 = mmap (NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd3, 0); printf ("mmap bank3 = %p\n", mem3); mem4 = mmap (NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd4, 0); printf ("mmap bank4 = %p\n", mem4); mem5 = mmap (NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd5, 0); printf ("mmap bank5 = %p\n", mem5); memset (mem1, 0xAA, MEMSIZE); memset (mem2, 0xBB, MEMSIZE); memset (mem3, 0xCC, MEMSIZE); memset (mem4, 0xDD, MEMSIZE); memset (mem5, 0xEE, MEMSIZE); } Output: sizeof(void *) = 8 sizeof(int) = 4 sizeof(long) = 8 memsize = 2147483648 shm_unlink bank1 = 0 shm_unlink bank2 = 0 shm_unlink bank3 = 0 shm_unlink bank4 = 0 shm_unlink bank5 = 0 fd1 = 3 fd2 = 4 fd3 = 5 fd4 = 6 fd5 = 7 ftruncate bank1 = 0 ftruncate bank2 = 0 ftruncate bank3 = 0 ftruncate bank4 = 0 ftruncate bank5 = 0 mmap bank1 = 0x6008000 mmap bank2 = 0x8ff4e000 mmap bank3 = 0x10ff4e000 mmap bank4 = 0x18ff4e000 mmap bank5 = 0x20ff4e000