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syscall: add Mmap, Munmap on Linux, FreeBSD, OS X

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* tweak mksyscall*.pl to be more gofmt-compatible.
* add mkall.sh -syscalls option.
* add sys/mman.h constants on OS X

R=r, eds, niemeyer
CC=golang-dev
https://golang.org/cl/4369044
This commit is contained in:
Russ Cox 2011-04-06 17:52:02 -04:00
parent c45a08e5ba
commit 48ae1f2d9b
22 changed files with 343 additions and 16 deletions
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10
src/pkg/syscall/syscall_linux_386.go
View file

@ -56,6 +56,16 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
//sysnb setgroups(n int, list *_Gid_t) (errno int) = SYS_SETGROUPS32
//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int) = SYS__NEWSELECT
//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, errno int)
func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, errno int) {
page := uintptr(offset / 4096)
if offset != int64(page)*4096 {
return 0, EINVAL
}
return mmap2(addr, length, prot, flags, fd, page)
}
// Underlying system call writes to newoffset via pointer.
// Implemented in assembly to avoid allocation.
func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)