$ go doc os
package os // import "os"
Package os provides a platform-independent interface to operating system
functionality. The design is Unix-like, although the error handling is Go-like;
failing calls return values of type error rather than error numbers. Often, more
information is available within the error. For example, if a call that takes a
file name fails, such as Open or Stat, the error will include the failing file
name when printed and will be of type *PathError, which may be unpacked for more
information.
The os interface is intended to be uniform across all operating systems.
Features not generally available appear in the system-specific package syscall.
Here is a simple example, opening a file and reading some of it.
file, err := os.Open("file.go") // For read access.
if err != nil {
log.Fatal(err)
}
If the open fails, the error string will be self-explanatory, like
open file.go: no such file or directory
The file's data can then be read into a slice of bytes. Read and Write take
their byte counts from the length of the argument slice.
data := make([]byte, 100)
count, err := file.Read(data)
if err != nil {
log.Fatal(err)
}
fmt.Printf("read %d bytes: %q\n", count, data[:count])
Note: The maximum number of concurrent operations on a File may be limited by
the OS or the system. The number should be high, but exceeding it may degrade
performance or cause other issues.
const O_RDONLY int = syscall.O_RDONLY ...
const SEEK_SET int = 0 ...
const PathSeparator = '/' ...
const ModeDir = fs.ModeDir ...
const DevNull = "/dev/null"
var ErrInvalid = fs.ErrInvalid ...
var Stdin = NewFile(uintptr(syscall.Stdin), "/dev/stdin") ...
var Args []string
var ErrProcessDone = errors.New("os: process already finished")
func Chdir(dir string) error
func Chmod(name string, mode FileMode) error
func Chown(name string, uid, gid int) error
func Chtimes(name string, atime time.Time, mtime time.Time) error
func Clearenv()
func DirFS(dir string) fs.FS
func Environ() []string
func Executable() (string, error)
func Exit(code int)
func Expand(s string, mapping func(string) string) string
func ExpandEnv(s string) string
func Getegid() int
func Getenv(key string) string
func Geteuid() int
func Getgid() int
func Getgroups() ([]int, error)
func Getpagesize() int
func Getpid() int
func Getppid() int
func Getuid() int
func Getwd() (dir string, err error)
func Hostname() (name string, err error)
func IsExist(err error) bool
func IsNotExist(err error) bool
func IsPathSeparator(c uint8) bool
func IsPermission(err error) bool
func IsTimeout(err error) bool
func Lchown(name string, uid, gid int) error
func Link(oldname, newname string) error
func LookupEnv(key string) (string, bool)
func Mkdir(name string, perm FileMode) error
func MkdirAll(path string, perm FileMode) error
func MkdirTemp(dir, pattern string) (string, error)
func NewSyscallError(syscall string, err error) error
func Pipe() (r *File, w *File, err error)
func ReadFile(name string) ([]byte, error)
func Readlink(name string) (string, error)
func Remove(name string) error
func RemoveAll(path string) error
func Rename(oldpath, newpath string) error
func SameFile(fi1, fi2 FileInfo) bool
func Setenv(key, value string) error
func Symlink(oldname, newname string) error
func TempDir() string
func Truncate(name string, size int64) error
func Unsetenv(key string) error
func UserCacheDir() (string, error)
func UserConfigDir() (string, error)
func UserHomeDir() (string, error)
func WriteFile(name string, data []byte, perm FileMode) error
type DirEntry = fs.DirEntry
func ReadDir(name string) ([]DirEntry, error)
type File struct{ ... }
func Create(name string) (*File, error)
func CreateTemp(dir, pattern string) (*File, error)
func NewFile(fd uintptr, name string) *File
func Open(name string) (*File, error)
func OpenFile(name string, flag int, perm FileMode) (*File, error)
type FileInfo = fs.FileInfo
func Lstat(name string) (FileInfo, error)
func Stat(name string) (FileInfo, error)
type FileMode = fs.FileMode
type LinkError struct{ ... }
type PathError = fs.PathError
type ProcAttr struct{ ... }
type Process struct{ ... }
func FindProcess(pid int) (*Process, error)
func StartProcess(name string, argv []string, attr *ProcAttr) (*Process, error)
type ProcessState struct{ ... }
type Signal interface{ ... }
var Interrupt Signal = syscall.SIGINT ...
type SyscallError struct{ ... } |
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