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Source file src/syscall/syscall.go

     1	// Copyright 2009 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 contains an interface to the low-level operating system
     6	// primitives. The details vary depending on the underlying system, and
     7	// by default, godoc will display the syscall documentation for the current
     8	// system. If you want godoc to display syscall documentation for another
     9	// system, set $GOOS and $GOARCH to the desired system. For example, if
    10	// you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
    11	// to freebsd and $GOARCH to arm.
    12	// The primary use of syscall is inside other packages that provide a more
    13	// portable interface to the system, such as "os", "time" and "net".  Use
    14	// those packages rather than this one if you can.
    15	// For details of the functions and data types in this package consult
    16	// the manuals for the appropriate operating system.
    17	// These calls return err == nil to indicate success; otherwise
    18	// err is an operating system error describing the failure.
    19	// On most systems, that error has type syscall.Errno.
    20	//
    21	// NOTE: This package is locked down. Code outside the standard
    22	// Go repository should be migrated to use the corresponding
    23	// package in the golang.org/x/sys repository. That is also where updates
    24	// required by new systems or versions should be applied.
    25	// See https://golang.org/s/go1.4-syscall for more information.
    26	//
    27	package syscall
    28	
    29	import "unsafe"
    30	
    31	//go:generate go run mksyscall_windows.go -systemdll -output zsyscall_windows.go syscall_windows.go security_windows.go
    32	
    33	// StringByteSlice converts a string to a NUL-terminated []byte,
    34	// If s contains a NUL byte this function panics instead of
    35	// returning an error.
    36	//
    37	// Deprecated: Use ByteSliceFromString instead.
    38	func StringByteSlice(s string) []byte {
    39		a, err := ByteSliceFromString(s)
    40		if err != nil {
    41			panic("syscall: string with NUL passed to StringByteSlice")
    42		}
    43		return a
    44	}
    45	
    46	// ByteSliceFromString returns a NUL-terminated slice of bytes
    47	// containing the text of s. If s contains a NUL byte at any
    48	// location, it returns (nil, EINVAL).
    49	func ByteSliceFromString(s string) ([]byte, error) {
    50		for i := 0; i < len(s); i++ {
    51			if s[i] == 0 {
    52				return nil, EINVAL
    53			}
    54		}
    55		a := make([]byte, len(s)+1)
    56		copy(a, s)
    57		return a, nil
    58	}
    59	
    60	// StringBytePtr returns a pointer to a NUL-terminated array of bytes.
    61	// If s contains a NUL byte this function panics instead of returning
    62	// an error.
    63	//
    64	// Deprecated: Use BytePtrFromString instead.
    65	func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
    66	
    67	// BytePtrFromString returns a pointer to a NUL-terminated array of
    68	// bytes containing the text of s. If s contains a NUL byte at any
    69	// location, it returns (nil, EINVAL).
    70	func BytePtrFromString(s string) (*byte, error) {
    71		a, err := ByteSliceFromString(s)
    72		if err != nil {
    73			return nil, err
    74		}
    75		return &a[0], nil
    76	}
    77	
    78	// Single-word zero for use when we need a valid pointer to 0 bytes.
    79	// See mksyscall.pl.
    80	var _zero uintptr
    81	
    82	func (ts *Timespec) Unix() (sec int64, nsec int64) {
    83		return int64(ts.Sec), int64(ts.Nsec)
    84	}
    85	
    86	func (tv *Timeval) Unix() (sec int64, nsec int64) {
    87		return int64(tv.Sec), int64(tv.Usec) * 1000
    88	}
    89	
    90	func (ts *Timespec) Nano() int64 {
    91		return int64(ts.Sec)*1e9 + int64(ts.Nsec)
    92	}
    93	
    94	func (tv *Timeval) Nano() int64 {
    95		return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
    96	}
    97	
    98	// Getpagesize is provided by the runtime.
    99	
   100	func Getpagesize() int
   101	
   102	// use is a no-op, but the compiler cannot see that it is.
   103	// Calling use(p) ensures that p is kept live until that point.
   104	// This was needed until Go 1.6 to call syscall.Syscall correctly.
   105	// As of Go 1.6 the compiler handles that case automatically.
   106	// The uses and definition of use can be removed early in the Go 1.7 cycle.
   107	//go:noescape
   108	func use(p unsafe.Pointer)
   109	

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