mmap currently sets errno to EINVAL when it should be ENOMEM.
SUS/POSIX states that ENOMEM should be returned when:

"MAP_FIXED was specified, and the range [addr, addr + len) exceeds
that allowed for the address space of a process; or if MAP_FIXED was
not specified and there is insufficient room in the address space to
effect the mapping."

The following patch (against 2.4.17) fixes this behaviour:

--- linux/mm/mmap.c~	Tue Nov  6 11:12:25 2001
+++ linux/mm/mmap.c	Mon Feb 11 15:49:58 2002
@@ -620,7 +620,7 @@
 {
 	if (flags & MAP_FIXED) {
 		if (addr > TASK_SIZE - len)
-			return -EINVAL;
+			return -ENOMEM;
 		if (addr & ~PAGE_MASK)
 			return -EINVAL;
 		return addr;

Chris
-- 
cyeoh@au.ibm.com
IBM OzLabs Linux Development Group
Canberra, Australia
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