vm: add MAP_FIXED

diff --git a/include/sys/mman.h b/include/sys/mman.h
index 4a28810cad3e277fd26bbd9d3fafafc298a01916..406db8c9f838766eada9c342e6d56ae42d688346 100644 (file)
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -56,6 +56,8 @@ typedef       __off_t         off_t;          /* file offset */
 #define        MAP_ALIGNMENT_64KB      MAP_ALIGN64K
 #define        MAP_IPC_SHARED  0x0100  /* share changes */
 
+#define MAP_FIXED      0x0200  /* require mapping to happen at hint */
+
 /*
  * Error indicator returned by mmap(2)
  */

diff --git a/servers/vm/mmap.c b/servers/vm/mmap.c
index dc9cc7c881c2208d7245f0b82e4fac1bfe7d6dcc..b74571613282870bf3ef3369333c0db6dc62e024 100644 (file)
--- a/servers/vm/mmap.c
+++ b/servers/vm/mmap.c
@@ -88,6 +88,8 @@ int do_mmap(message *m)
                        addr = arch_vir2map(vmp, m->VMM_ADDR);
                        vr = map_page_region(vmp, addr, 0, len, MAP_NONE,
                                vrflags, mfflags);
+                       if(!vr && (m->VMM_FLAGS & MAP_FIXED))
+                               return ENOMEM;
                }
                if (!vr) {
                        /* No address given or address already in use. */