diff options
Diffstat (limited to 'sysdeps/mach/hurd')
| -rw-r--r-- | sysdeps/mach/hurd/mmap.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/sysdeps/mach/hurd/mmap.c b/sysdeps/mach/hurd/mmap.c index 97930778ae..4f9304f4f5 100644 --- a/sysdeps/mach/hurd/mmap.c +++ b/sysdeps/mach/hurd/mmap.c @@ -66,16 +66,27 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) { case PROT_READ: memobj = robj; - __mach_port_deallocate (__mach_task_self (), wobj); + if (wobj != MACH_PORT_NULL) + __mach_port_deallocate (__mach_task_self (), wobj); break; case PROT_WRITE: memobj = wobj; - __mach_port_deallocate (__mach_task_self (), robj); + if (robj != MACH_PORT_NULL) + __mach_port_deallocate (__mach_task_self (), robj); break; case PROT_READ|PROT_WRITE: - __mach_port_deallocate (__mach_task_self (), robj); if (robj == wobj) - memobj = wobj; + { + memobj = wobj; + /* Remove extra reference. */ + __mach_port_deallocate (__mach_task_self (), memobj); + } + else if (wobj == MACH_PORT_NULL && /* Not writable by mapping. */ + (flags & (MAP_COPY|MAP_PRIVATE))) + /* The file can only be mapped for reading. Since we are + making a private mapping, we will never try to write the + object anyway, so we don't care. */ + memobj = robj; else { __mach_port_deallocate (__mach_task_self (), wobj); @@ -96,7 +107,9 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) memobj, (vm_offset_t) offset, flags & (MAP_COPY|MAP_PRIVATE), vmprot, VM_PROT_ALL, - flags & MAP_INHERIT); + (flags & MAP_INHERIT) == 0 ? VM_INHERIT_NONE : + (flags & (MAP_COPY|MAP_PRIVATE)) ? VM_INHERIT_COPY : + VM_INHERIT_SHARE); if (memobj != MACH_PORT_NULL) __mach_port_deallocate (__mach_task_self (), memobj); @@ -105,4 +118,4 @@ __mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset) } weak_alias (__mmap, mmap) - + |