diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/syscall_unix.go')
| -rw-r--r-- | vendor/golang.org/x/sys/unix/syscall_unix.go | 85 |
1 files changed, 73 insertions, 12 deletions
diff --git a/vendor/golang.org/x/sys/unix/syscall_unix.go b/vendor/golang.org/x/sys/unix/syscall_unix.go index 00bafda..4e92e5a 100644 --- a/vendor/golang.org/x/sys/unix/syscall_unix.go +++ b/vendor/golang.org/x/sys/unix/syscall_unix.go @@ -3,7 +3,6 @@ // license that can be found in the LICENSE file. //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris -// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris package unix @@ -147,6 +146,23 @@ func (m *mmapper) Munmap(data []byte) (err error) { return nil } +func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { + return mapper.Mmap(fd, offset, length, prot, flags) +} + +func Munmap(b []byte) (err error) { + return mapper.Munmap(b) +} + +func MmapPtr(fd int, offset int64, addr unsafe.Pointer, length uintptr, prot int, flags int) (ret unsafe.Pointer, err error) { + xaddr, err := mapper.mmap(uintptr(addr), length, prot, flags, fd, offset) + return unsafe.Pointer(xaddr), err +} + +func MunmapPtr(addr unsafe.Pointer, length uintptr) (err error) { + return mapper.munmap(uintptr(addr), length) +} + func Read(fd int, p []byte) (n int, err error) { n, err = read(fd, p) if raceenabled { @@ -331,6 +347,19 @@ func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) { return } +// Recvmsg receives a message from a socket using the recvmsg system call. The +// received non-control data will be written to p, and any "out of band" +// control data will be written to oob. The flags are passed to recvmsg. +// +// The results are: +// - n is the number of non-control data bytes read into p +// - oobn is the number of control data bytes read into oob; this may be interpreted using [ParseSocketControlMessage] +// - recvflags is flags returned by recvmsg +// - from is the address of the sender +// +// If the underlying socket type is not SOCK_DGRAM, a received message +// containing oob data and a single '\0' of non-control data is treated as if +// the message contained only control data, i.e. n will be zero on return. func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { var iov [1]Iovec if len(p) > 0 { @@ -346,13 +375,9 @@ func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from return } -// RecvmsgBuffers receives a message from a socket using the recvmsg -// system call. The flags are passed to recvmsg. Any non-control data -// read is scattered into the buffers slices. The results are: -// - n is the number of non-control data read into bufs -// - oobn is the number of control data read into oob; this may be interpreted using [ParseSocketControlMessage] -// - recvflags is flags returned by recvmsg -// - from is the address of the sender +// RecvmsgBuffers receives a message from a socket using the recvmsg system +// call. This function is equivalent to Recvmsg, but non-control data read is +// scattered into the buffers slices. func RecvmsgBuffers(fd int, buffers [][]byte, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { iov := make([]Iovec, len(buffers)) for i := range buffers { @@ -371,11 +396,38 @@ func RecvmsgBuffers(fd int, buffers [][]byte, oob []byte, flags int) (n, oobn in return } +// Sendmsg sends a message on a socket to an address using the sendmsg system +// call. This function is equivalent to SendmsgN, but does not return the +// number of bytes actually sent. func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { _, err = SendmsgN(fd, p, oob, to, flags) return } +// SendmsgN sends a message on a socket to an address using the sendmsg system +// call. p contains the non-control data to send, and oob contains the "out of +// band" control data. The flags are passed to sendmsg. The number of +// non-control bytes actually written to the socket is returned. +// +// Some socket types do not support sending control data without accompanying +// non-control data. If p is empty, and oob contains control data, and the +// underlying socket type is not SOCK_DGRAM, p will be treated as containing a +// single '\0' and the return value will indicate zero bytes sent. +// +// The Go function Recvmsg, if called with an empty p and a non-empty oob, +// will read and ignore this additional '\0'. If the message is received by +// code that does not use Recvmsg, or that does not use Go at all, that code +// will need to be written to expect and ignore the additional '\0'. +// +// If you need to send non-empty oob with p actually empty, and if the +// underlying socket type supports it, you can do so via a raw system call as +// follows: +// +// msg := &unix.Msghdr{ +// Control: &oob[0], +// } +// msg.SetControllen(len(oob)) +// n, _, errno := unix.Syscall(unix.SYS_SENDMSG, uintptr(fd), uintptr(unsafe.Pointer(msg)), flags) func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { var iov [1]Iovec if len(p) > 0 { @@ -394,9 +446,8 @@ func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) } // SendmsgBuffers sends a message on a socket to an address using the sendmsg -// system call. The flags are passed to sendmsg. Any non-control data written -// is gathered from buffers. The function returns the number of bytes written -// to the socket. +// system call. This function is equivalent to SendmsgN, but the non-control +// data is gathered from buffers. func SendmsgBuffers(fd int, buffers [][]byte, oob []byte, to Sockaddr, flags int) (n int, err error) { iov := make([]Iovec, len(buffers)) for i := range buffers { @@ -506,6 +557,9 @@ func SetNonblock(fd int, nonblocking bool) (err error) { if err != nil { return err } + if (flag&O_NONBLOCK != 0) == nonblocking { + return nil + } if nonblocking { flag |= O_NONBLOCK } else { @@ -543,7 +597,7 @@ func Lutimes(path string, tv []Timeval) error { return UtimesNanoAt(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW) } -// emptyIovec reports whether there are no bytes in the slice of Iovec. +// emptyIovecs reports whether there are no bytes in the slice of Iovec. func emptyIovecs(iov []Iovec) bool { for i := range iov { if iov[i].Len > 0 { @@ -552,3 +606,10 @@ func emptyIovecs(iov []Iovec) bool { } return true } + +// Setrlimit sets a resource limit. +func Setrlimit(resource int, rlim *Rlimit) error { + // Just call the syscall version, because as of Go 1.21 + // it will affect starting a new process. + return syscall.Setrlimit(resource, (*syscall.Rlimit)(rlim)) +} |