FreeBSD Bugzilla – Attachment 109266 Details for
Bug 150260
[libc] mmap(2) fails with EPERM (not documented) if read-only shared memory is mmapped with MAP_PRIVATE & PROT_WRITE
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file.txt
file.txt (text/plain), 956 bytes, created by
Ion Gaztañaga
on 2010-09-03 23:00:13 UTC
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Description:
file.txt
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MIME Type:
Creator:
Ion Gaztañaga
Created:
2010-09-03 23:00:13 UTC
Size:
956 bytes
patch
obsolete
>#include <sys/types.h> >#include <sys/mman.h> >#include <stdio.h> >#include <unistd.h> >#include <fcntl.h> >#include <errno.h> > >int main() >{ > shm_unlink("/myshm"); > int fd = shm_open("/myshm", O_CREAT | O_RDWR, 0644); > if(fd >= 0){ > if(ftruncate(fd, 1000) < 0){ > printf("Error truncating"); > close(fd); > } > else{ > close(fd); > fd = shm_open("/myshm", O_RDONLY/*O_RDWR*/, 0644); > if(fd >= 0){ > void *addr = mmap(0, 1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); > if (MAP_FAILED == addr){ > printf("mmap failed, errno: %s", strerror(errno)); > } > else{ > printf("mmap OK"); > munmap(addr, 1000); > } > close(fd); > } > else{ > printf("Error opening shmem"); > } > } > } > else{ > printf("Error creating shmem"); > } > shm_unlink("/myshm"); > return 0; >}
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