syscall_linux.go

     1  // Copyright 2022 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Package syscall provides the syscall primitives required for the runtime.
     6  package syscall
     7  
     8  import (
     9  	"unsafe"
    10  )
    11  
    12  // TODO(https://go.dev/issue/51087): This package is incomplete and currently
    13  // only contains very minimal support for Linux.
    14  
    15  // Syscall6 calls system call number 'num' with arguments a1-6.
    16  func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
    17  
    18  func EpollCreate1(flags int32) (fd int32, errno uintptr) {
    19  	r1, _, e := Syscall6(SYS_EPOLL_CREATE1, uintptr(flags), 0, 0, 0, 0, 0)
    20  	return int32(r1), e
    21  }
    22  
    23  var _zero uintptr
    24  
    25  func EpollWait(epfd int32, events []EpollEvent, maxev, waitms int32) (n int32, errno uintptr) {
    26  	var ev unsafe.Pointer
    27  	if len(events) > 0 {
    28  		ev = unsafe.Pointer(&events[0])
    29  	} else {
    30  		ev = unsafe.Pointer(&_zero)
    31  	}
    32  	r1, _, e := Syscall6(SYS_EPOLL_PWAIT, uintptr(epfd), uintptr(ev), uintptr(maxev), uintptr(waitms), 0, 0)
    33  	return int32(r1), e
    34  }
    35  
    36  func EpollCtl(epfd, op, fd int32, event *EpollEvent) (errno uintptr) {
    37  	_, _, e := Syscall6(SYS_EPOLL_CTL, uintptr(epfd), uintptr(op), uintptr(fd), uintptr(unsafe.Pointer(event)), 0, 0)
    38  	return e
    39  }
    40  
    41  func Eventfd(initval, flags int32) (fd int32, errno uintptr) {
    42  	r1, _, e := Syscall6(SYS_EVENTFD2, uintptr(initval), uintptr(flags), 0, 0, 0, 0)
    43  	return int32(r1), e
    44  }
    45
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