diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/mmap.2 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2 index 174a083..a2be590 100644 --- a/lib/libc/sys/mmap.2 +++ b/lib/libc/sys/mmap.2 @@ -130,6 +130,25 @@ system calls. Modifications are private. .It Dv MAP_SHARED Modifications are shared. +.It Dv MAP_STACK +This option is only available if your system has been compiled with +VM_STACK defined when compiling the kernel. This is the default for +i386 only. Consider adding -DVM_STACK to COPTFLAGS in your /etc/make.conf +to enable this option for other architechures. MAP_STACK implies +MAP_ANON, and +.Fa offset +of 0. +.Fa fd +must be -1 and +.Fa prot +must include at least PROT_READ and PROT_WRITE. This option creates +a memory region that grows to at most +.Fa len +bytes in size, starting from the stack top and growing down. The +stack top is the starting address returned by the call, plus +.Fa len +bytes. The bottom of the stack at maximum growth is the starting +address returned by the call. .El .Pp The |
