mirror of
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4fd41e494a
Permit system calls to be designated as non-blocking, meaning that we simply call them without involving the scheduler. This change by itself is mostly performance neutral. In combination with a following change to the net package there is a performance advantage. R=rsc, dfc, r2, iant2, rsc1 CC=golang-dev https://golang.org/cl/4278055
115 lines
4.2 KiB
Go
115 lines
4.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package syscall
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import "unsafe"
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func Getpagesize() int { return 4096 }
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func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
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func NsecToTimespec(nsec int64) (ts Timespec) {
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ts.Sec = int32(nsec / 1e9)
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ts.Nsec = int32(nsec % 1e9)
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return
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}
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func NsecToTimeval(nsec int64) (tv Timeval) {
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nsec += 999 // round up to microsecond
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tv.Sec = int32(nsec / 1e9)
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tv.Usec = int32(nsec % 1e9 / 1e3)
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return
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}
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// Pread and Pwrite are special: they insert padding before the int64.
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// (Ftruncate and truncate are not; go figure.)
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func Pread(fd int, p []byte, offset int64) (n int, errno int) {
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var _p0 unsafe.Pointer
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if len(p) > 0 {
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_p0 = unsafe.Pointer(&p[0])
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}
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r0, _, e1 := Syscall6(SYS_PREAD64, uintptr(fd), uintptr(_p0), uintptr(len(p)), 0, uintptr(offset), uintptr(offset>>32))
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n = int(r0)
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errno = int(e1)
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return
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}
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func Pwrite(fd int, p []byte, offset int64) (n int, errno int) {
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var _p0 unsafe.Pointer
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if len(p) > 0 {
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_p0 = unsafe.Pointer(&p[0])
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}
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r0, _, e1 := Syscall6(SYS_PWRITE64, uintptr(fd), uintptr(_p0), uintptr(len(p)), 0, uintptr(offset), uintptr(offset>>32))
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n = int(r0)
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errno = int(e1)
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return
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}
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// Seek is defined in assembly.
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func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
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//sys accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
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//sys bind(s int, addr uintptr, addrlen _Socklen) (errno int)
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//sys connect(s int, addr uintptr, addrlen _Socklen) (errno int)
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//sysnb getgroups(n int, list *_Gid_t) (nn int, errno int) = SYS_GETGROUPS32
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//sysnb setgroups(n int, list *_Gid_t) (errno int) = SYS_SETGROUPS32
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//sys setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
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//sysnb socket(domain int, typ int, proto int) (fd int, errno int)
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//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
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//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
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//sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int)
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//sys sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int)
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//sysnb socketpair(domain int, typ int, flags int, fd *[2]int) (errno int)
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//sys recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)
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//sys sendmsg(s int, msg *Msghdr, flags int) (errno int)
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//sys Chown(path string, uid int, gid int) (errno int)
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//sys Fchown(fd int, uid int, gid int) (errno int)
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//sys Fstat(fd int, stat *Stat_t) (errno int) = SYS_FSTAT64
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//sys Fstatfs(fd int, buf *Statfs_t) (errno int) = SYS_FSTATFS64
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//sys Ftruncate(fd int, length int64) (errno int) = SYS_FTRUNCATE64
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//sysnb Getegid() (egid int)
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//sysnb Geteuid() (euid int)
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//sysnb Getgid() (gid int)
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//sysnb Getuid() (uid int)
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//sys Lchown(path string, uid int, gid int) (errno int)
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//sys Listen(s int, n int) (errno int)
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//sys Lstat(path string, stat *Stat_t) (errno int) = SYS_LSTAT64
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//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int) = SYS__NEWSELECT
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//sys Setfsgid(gid int) (errno int)
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//sys Setfsuid(uid int) (errno int)
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//sysnb Setgid(gid int) (errno int)
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//sysnb Setregid(rgid int, egid int) (errno int)
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//sysnb Setresgid(rgid int, egid int, sgid int) (errno int)
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//sysnb Setresuid(ruid int, euid int, suid int) (errno int)
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//sysnb Setreuid(ruid int, euid int) (errno int)
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//sys Shutdown(fd int, how int) (errno int)
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//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, errno int)
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//sys Stat(path string, stat *Stat_t) (errno int) = SYS_STAT64
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//sys Statfs(path string, buf *Statfs_t) (errno int) = SYS_STATFS64
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//sys Truncate(path string, length int64) (errno int) = SYS_TRUNCATE64
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// Vsyscalls on amd64.
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//sysnb Gettimeofday(tv *Timeval) (errno int)
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//sysnb Time(t *Time_t) (tt Time_t, errno int)
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// TODO(kaib): add support for tracing
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func (r *PtraceRegs) PC() uint64 { return 0 }
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func (r *PtraceRegs) SetPC(pc uint64) {}
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func (iov *Iovec) SetLen(length int) {
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iov.Len = uint32(length)
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}
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func (msghdr *Msghdr) SetControllen(length int) {
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msghdr.Controllen = uint32(length)
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}
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func (cmsg *Cmsghdr) SetLen(length int) {
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cmsg.Len = uint32(length)
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}
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