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Source file src/syscall/syscall.go

Documentation: syscall

     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  // Deprecated: this package is locked down. Callers should use the
    22  // corresponding package in the golang.org/x/sys repository instead.
    23  // That is also where updates required by new systems or versions
    24  // should be applied. See https://golang.org/s/go1.4-syscall for more
    25  // information.
    26  //
    27  package syscall
    28  
    29  //go:generate go run mksyscall_windows.go -systemdll -output zsyscall_windows.go syscall_windows.go security_windows.go
    30  
    31  // StringByteSlice converts a string to a NUL-terminated []byte,
    32  // If s contains a NUL byte this function panics instead of
    33  // returning an error.
    34  //
    35  // Deprecated: Use ByteSliceFromString instead.
    36  func StringByteSlice(s string) []byte {
    37  	a, err := ByteSliceFromString(s)
    38  	if err != nil {
    39  		panic("syscall: string with NUL passed to StringByteSlice")
    40  	}
    41  	return a
    42  }
    43  
    44  // ByteSliceFromString returns a NUL-terminated slice of bytes
    45  // containing the text of s. If s contains a NUL byte at any
    46  // location, it returns (nil, EINVAL).
    47  func ByteSliceFromString(s string) ([]byte, error) {
    48  	for i := 0; i < len(s); i++ {
    49  		if s[i] == 0 {
    50  			return nil, EINVAL
    51  		}
    52  	}
    53  	a := make([]byte, len(s)+1)
    54  	copy(a, s)
    55  	return a, nil
    56  }
    57  
    58  // StringBytePtr returns a pointer to a NUL-terminated array of bytes.
    59  // If s contains a NUL byte this function panics instead of returning
    60  // an error.
    61  //
    62  // Deprecated: Use BytePtrFromString instead.
    63  func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
    64  
    65  // BytePtrFromString returns a pointer to a NUL-terminated array of
    66  // bytes containing the text of s. If s contains a NUL byte at any
    67  // location, it returns (nil, EINVAL).
    68  func BytePtrFromString(s string) (*byte, error) {
    69  	a, err := ByteSliceFromString(s)
    70  	if err != nil {
    71  		return nil, err
    72  	}
    73  	return &a[0], nil
    74  }
    75  
    76  // Single-word zero for use when we need a valid pointer to 0 bytes.
    77  // See mksyscall.pl.
    78  var _zero uintptr
    79  
    80  // Unix returns ts as the number of seconds and nanoseconds elapsed since the
    81  // Unix epoch.
    82  func (ts *Timespec) Unix() (sec int64, nsec int64) {
    83  	return int64(ts.Sec), int64(ts.Nsec)
    84  }
    85  
    86  // Unix returns tv as the number of seconds and nanoseconds elapsed since the
    87  // Unix epoch.
    88  func (tv *Timeval) Unix() (sec int64, nsec int64) {
    89  	return int64(tv.Sec), int64(tv.Usec) * 1000
    90  }
    91  
    92  // Nano returns ts as the number of nanoseconds elapsed since the Unix epoch.
    93  func (ts *Timespec) Nano() int64 {
    94  	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
    95  }
    96  
    97  // Nano returns tv as the number of nanoseconds elapsed since the Unix epoch.
    98  func (tv *Timeval) Nano() int64 {
    99  	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
   100  }
   101  
   102  // Getpagesize and Exit are provided by the runtime.
   103  
   104  func Getpagesize() int
   105  func Exit(code int)
   106  

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