github.com/go-xe2/third@v1.0.3/golang.org/x/sys/unix/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  // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
     6  
     7  // Package unix contains an interface to the low-level operating system
     8  // primitives. OS details vary depending on the underlying system, and
     9  // by default, godoc will display OS-specific documentation for the current
    10  // system. If you want godoc to display OS documentation for another
    11  // system, set $GOOS and $GOARCH to the desired system. For example, if
    12  // you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
    13  // to freebsd and $GOARCH to arm.
    14  //
    15  // The primary use of this package is inside other packages that provide a more
    16  // portable interface to the system, such as "os", "time" and "net".  Use
    17  // those packages rather than this one if you can.
    18  //
    19  // For details of the functions and data types in this package consult
    20  // the manuals for the appropriate operating system.
    21  //
    22  // These calls return err == nil to indicate success; otherwise
    23  // err represents an operating system error describing the failure and
    24  // holds a value of type syscall.Errno.
    25  package unix // import "github.com/go-xe2/third/golang.org/x/sys/unix"
    26  
    27  import "strings"
    28  
    29  // ByteSliceFromString returns a NUL-terminated slice of bytes
    30  // containing the text of s. If s contains a NUL byte at any
    31  // location, it returns (nil, EINVAL).
    32  func ByteSliceFromString(s string) ([]byte, error) {
    33  	if strings.IndexByte(s, 0) != -1 {
    34  		return nil, EINVAL
    35  	}
    36  	a := make([]byte, len(s)+1)
    37  	copy(a, s)
    38  	return a, nil
    39  }
    40  
    41  // BytePtrFromString returns a pointer to a NUL-terminated array of
    42  // bytes containing the text of s. If s contains a NUL byte at any
    43  // location, it returns (nil, EINVAL).
    44  func BytePtrFromString(s string) (*byte, error) {
    45  	a, err := ByteSliceFromString(s)
    46  	if err != nil {
    47  		return nil, err
    48  	}
    49  	return &a[0], nil
    50  }
    51  
    52  // Single-word zero for use when we need a valid pointer to 0 bytes.
    53  // See mkunix.pl.
    54  var _zero uintptr