github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/src/pkg/syscall/syscall.go (about)

     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  package syscall
    21  
    22  // StringByteSlice is deprecated. Use ByteSliceFromString instead.
    23  // If s contains a NUL byte this function panics instead of
    24  // returning an error.
    25  func StringByteSlice(s string) []byte {
    26  	a, err := ByteSliceFromString(s)
    27  	if err != nil {
    28  		panic("syscall: string with NUL passed to StringByteSlice")
    29  	}
    30  	return a
    31  }
    32  
    33  // ByteSliceFromString returns a NUL-terminated slice of bytes
    34  // containing the text of s. If s contains a NUL byte at any
    35  // location, it returns (nil, EINVAL).
    36  func ByteSliceFromString(s string) ([]byte, error) {
    37  	for i := 0; i < len(s); i++ {
    38  		if s[i] == 0 {
    39  			return nil, EINVAL
    40  		}
    41  	}
    42  	a := make([]byte, len(s)+1)
    43  	copy(a, s)
    44  	return a, nil
    45  }
    46  
    47  // StringBytePtr is deprecated. Use BytePtrFromString instead.
    48  // If s contains a NUL byte this function panics instead of
    49  // returning an error.
    50  func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
    51  
    52  // BytePtrFromString returns a pointer to a NUL-terminated array of
    53  // bytes containing the text of s. If s contains a NUL byte at any
    54  // location, it returns (nil, EINVAL).
    55  func BytePtrFromString(s string) (*byte, error) {
    56  	a, err := ByteSliceFromString(s)
    57  	if err != nil {
    58  		return nil, err
    59  	}
    60  	return &a[0], nil
    61  }
    62  
    63  // Single-word zero for use when we need a valid pointer to 0 bytes.
    64  // See mksyscall.pl.
    65  var _zero uintptr
    66  
    67  func (ts *Timespec) Unix() (sec int64, nsec int64) {
    68  	return int64(ts.Sec), int64(ts.Nsec)
    69  }
    70  
    71  func (tv *Timeval) Unix() (sec int64, nsec int64) {
    72  	return int64(tv.Sec), int64(tv.Usec) * 1000
    73  }
    74  
    75  func (ts *Timespec) Nano() int64 {
    76  	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
    77  }
    78  
    79  func (tv *Timeval) Nano() int64 {
    80  	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
    81  }