os

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Published: Feb 10, 2020 License: BSD-3-Clause Imports: 11 Imported by: 0

Documentation

Overview

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])

Index

Examples

Constants

View Source
const (
	// Exactly one of O_RDONLY, O_WRONLY, or O_RDWR must be specified.
	O_RDONLY int = syscall.O_RDONLY // open the file read-only.
	O_WRONLY int = syscall.O_WRONLY // open the file write-only.
	O_RDWR   int = syscall.O_RDWR   // open the file read-write.
	// The remaining values may be or'ed in to control behavior.
	O_APPEND int = syscall.O_APPEND // append data to the file when writing.
	O_CREATE int = syscall.O_CREAT  // create a new file if none exists.
	O_EXCL   int = syscall.O_EXCL   // used with O_CREATE, file must not exist.
	O_SYNC   int = syscall.O_SYNC   // open for synchronous I/O.
	O_TRUNC  int = syscall.O_TRUNC  // if possible, truncate file when opened.
)

Flags to OpenFile wrapping those of the underlying system. Not all flags may be implemented on a given system.

View Source
const (
	SEEK_SET int = 0 // seek relative to the origin of the file
	SEEK_CUR int = 1 // seek relative to the current offset
	SEEK_END int = 2 // seek relative to the end
)

Seek whence values.

Deprecated: Use io.SeekStart, io.SeekCurrent, and io.SeekEnd.

View Source
const (
	PathSeparator     = '/' // OS-specific path separator
	PathListSeparator = ':' // OS-specific path list separator
)
View Source
const DevNull = "/dev/null"

DevNull is the name of the operating system's “null device.” On Unix-like systems, it is "/dev/null"; on Windows, "NUL".

Variables

View Source
var (
	ErrInvalid    = errors.New("invalid argument") // methods on File will return this error when the receiver is nil
	ErrPermission = errors.New("permission denied")
	ErrExist      = errors.New("file already exists")
	ErrNotExist   = errors.New("file does not exist")
	ErrClosed     = errors.New("file already closed")
	ErrNoDeadline = poll.ErrNoDeadline
)

Portable analogs of some common system call errors.

View Source
var (
	Stdin  = NewFile(uintptr(syscall.Stdin), "/dev/stdin")
	Stdout = NewFile(uintptr(syscall.Stdout), "/dev/stdout")
	Stderr = NewFile(uintptr(syscall.Stderr), "/dev/stderr")
)

Stdin, Stdout, and Stderr are open Files pointing to the standard input, standard output, and standard error file descriptors.

Note that the Go runtime writes to standard error for panics and crashes; closing Stderr may cause those messages to go elsewhere, perhaps to a file opened later.

View Source
var Args []string

Args hold the command-line arguments, starting with the program name.

Functions

func Chdir

func Chdir(dir string) error

Chdir changes the current working directory to the named directory. If there is an error, it will be of type *PathError.

func Chmod

func Chmod(name string, mode FileMode) error

Chmod changes the mode of the named file to mode. If the file is a symbolic link, it changes the mode of the link's target. If there is an error, it will be of type *PathError.

A different subset of the mode bits are used, depending on the operating system.

On Unix, the mode's permission bits, ModeSetuid, ModeSetgid, and ModeSticky are used.

On Windows, the mode must be non-zero but otherwise only the 0200 bit (owner writable) of mode is used; it controls whether the file's read-only attribute is set or cleared. attribute. The other bits are currently unused. Use mode 0400 for a read-only file and 0600 for a readable+writable file.

On Plan 9, the mode's permission bits, ModeAppend, ModeExclusive, and ModeTemporary are used.

Example
package main

import (
	"log"
	"os"
)

func main() {
	if err := os.Chmod("some-filename", 0644); err != nil {
		log.Fatal(err)
	}
}
Output:

func Chown

func Chown(name string, uid, gid int) error

Chown changes the numeric uid and gid of the named file. If the file is a symbolic link, it changes the uid and gid of the link's target. A uid or gid of -1 means to not change that value. If there is an error, it will be of type *PathError.

On Windows or Plan 9, Chown always returns the syscall.EWINDOWS or EPLAN9 error, wrapped in *PathError.

func Chtimes

func Chtimes(name string, atime time.Time, mtime time.Time) error

Chtimes changes the access and modification times of the named file, similar to the Unix utime() or utimes() functions.

The underlying filesystem may truncate or round the values to a less precise time unit. If there is an error, it will be of type *PathError.

Example
package main

import (
	"log"
	"os"
	"time"
)

func main() {
	mtime := time.Date(2006, time.February, 1, 3, 4, 5, 0, time.UTC)
	atime := time.Date(2007, time.March, 2, 4, 5, 6, 0, time.UTC)
	if err := os.Chtimes("some-filename", atime, mtime); err != nil {
		log.Fatal(err)
	}
}
Output:

func Clearenv

func Clearenv()

Clearenv deletes all environment variables.

func Environ

func Environ() []string

Environ returns a copy of strings representing the environment, in the form "key=value".

func Executable

func Executable() (string, error)

Executable returns the path name for the executable that started the current process. There is no guarantee that the path is still pointing to the correct executable. If a symlink was used to start the process, depending on the operating system, the result might be the symlink or the path it pointed to. If a stable result is needed, path/filepath.EvalSymlinks might help.

Executable returns an absolute path unless an error occurred.

The main use case is finding resources located relative to an executable.

Executable is not supported on nacl.

func Exit

func Exit(code int)

Exit causes the current program to exit with the given status code. Conventionally, code zero indicates success, non-zero an error. The program terminates immediately; deferred functions are not run.

func Expand

func Expand(s string, mapping func(string) string) string

Expand replaces ${var} or $var in the string based on the mapping function. For example, os.ExpandEnv(s) is equivalent to os.Expand(s, os.Getenv).

Example
package main

import (
	"fmt"
	"os"
)

func main() {
	mapper := func(placeholderName string) string {
		switch placeholderName {
		case "DAY_PART":
			return "morning"
		case "USER":
			return "Gopher"
		}

		return ""
	}

	fmt.Println(os.Expand("Good ${DAY_PART}, $USER!", mapper))

}
Output:

Good morning, Gopher!

func ExpandEnv

func ExpandEnv(s string) string

ExpandEnv replaces ${var} or $var in the string according to the values of the current environment variables. References to undefined variables are replaced by the empty string.

Example
package main

import (
	"fmt"
	"os"
)

func main() {
	fmt.Println(os.ExpandEnv("$USER lives in ${HOME}."))

}
Output:

gopher lives in /usr/gopher.

func Getegid

func Getegid() int

Getegid returns the numeric effective group id of the caller.

On Windows, it returns -1.

func Getenv

func Getenv(key string) string

Getenv retrieves the value of the environment variable named by the key. It returns the value, which will be empty if the variable is not present. To distinguish between an empty value and an unset value, use LookupEnv.

Example
package main

import (
	"fmt"
	"os"
)

func main() {
	fmt.Printf("%s lives in %s.\n", os.Getenv("USER"), os.Getenv("HOME"))

}
Output:

gopher lives in /usr/gopher.

func Geteuid

func Geteuid() int

Geteuid returns the numeric effective user id of the caller.

On Windows, it returns -1.

func Getgid

func Getgid() int

Getgid returns the numeric group id of the caller.

On Windows, it returns -1.

func Getgroups

func Getgroups() ([]int, error)

Getgroups returns a list of the numeric ids of groups that the caller belongs to.

On Windows, it returns syscall.EWINDOWS. See the os/user package for a possible alternative.

func Getpagesize

func Getpagesize() int

Getpagesize returns the underlying system's memory page size.

func Getpid

func Getpid() int

Getpid returns the process id of the caller.

func Getppid

func Getppid() int

Getppid returns the process id of the caller's parent.

func Getuid

func Getuid() int

Getuid returns the numeric user id of the caller.

On Windows, it returns -1.

func Getwd

func Getwd() (dir string, err error)

Getwd returns a rooted path name corresponding to the current directory. If the current directory can be reached via multiple paths (due to symbolic links), Getwd may return any one of them.

func Hostname

func Hostname() (name string, err error)

Hostname returns the host name reported by the kernel.

func IsExist

func IsExist(err error) bool

IsExist returns a boolean indicating whether the error is known to report that a file or directory already exists. It is satisfied by ErrExist as well as some syscall errors.

func IsNotExist

func IsNotExist(err error) bool

IsNotExist returns a boolean indicating whether the error is known to report that a file or directory does not exist. It is satisfied by ErrNotExist as well as some syscall errors.

Example
package main

import (
	"fmt"
	"os"
)

func main() {
	filename := "a-nonexistent-file"
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		fmt.Printf("file does not exist")
	}
}
Output:

file does not exist

func IsPathSeparator

func IsPathSeparator(c uint8) bool

IsPathSeparator reports whether c is a directory separator character.

func IsPermission

func IsPermission(err error) bool

IsPermission returns a boolean indicating whether the error is known to report that permission is denied. It is satisfied by ErrPermission as well as some syscall errors.

func IsTimeout

func IsTimeout(err error) bool

IsTimeout returns a boolean indicating whether the error is known to report that a timeout occurred.

func Lchown

func Lchown(name string, uid, gid int) error

Lchown changes the numeric uid and gid of the named file. If the file is a symbolic link, it changes the uid and gid of the link itself. If there is an error, it will be of type *PathError.

On Windows, it always returns the syscall.EWINDOWS error, wrapped in *PathError.

func Link(oldname, newname string) error

Link creates newname as a hard link to the oldname file. If there is an error, it will be of type *LinkError.

func LookupEnv

func LookupEnv(key string) (string, bool)

LookupEnv retrieves the value of the environment variable named by the key. If the variable is present in the environment the value (which may be empty) is returned and the boolean is true. Otherwise the returned value will be empty and the boolean will be false.

Example
package main

import (
	"fmt"
	"os"
)

func main() {
	show := func(key string) {
		val, ok := os.LookupEnv(key)
		if !ok {
			fmt.Printf("%s not set\n", key)
		} else {
			fmt.Printf("%s=%s\n", key, val)
		}
	}

	show("USER")
	show("GOPATH")

}
Output:

USER=gopher
GOPATH not set

func Mkdir

func Mkdir(name string, perm FileMode) error

Mkdir creates a new directory with the specified name and permission bits (before umask). If there is an error, it will be of type *PathError.

func MkdirAll

func MkdirAll(path string, perm FileMode) error

MkdirAll creates a directory named path, along with any necessary parents, and returns nil, or else returns an error. The permission bits perm (before umask) are used for all directories that MkdirAll creates. If path is already a directory, MkdirAll does nothing and returns nil.

func NewSyscallError

func NewSyscallError(syscall string, err error) error

NewSyscallError returns, as an error, a new SyscallError with the given system call name and error details. As a convenience, if err is nil, NewSyscallError returns nil.

func Pipe

func Pipe() (r *File, w *File, err error)

Pipe returns a connected pair of Files; reads from r return bytes written to w. It returns the files and an error, if any.

func Readlink(name string) (string, error)

Readlink returns the destination of the named symbolic link. If there is an error, it will be of type *PathError.

func Remove

func Remove(name string) error

Remove removes the named file or (empty) directory. If there is an error, it will be of type *PathError.

func RemoveAll

func RemoveAll(path string) error

RemoveAll removes path and any children it contains. It removes everything it can but returns the first error it encounters. If the path does not exist, RemoveAll returns nil (no error).

func Rename

func Rename(oldpath, newpath string) error

Rename renames (moves) oldpath to newpath. If newpath already exists and is not a directory, Rename replaces it. OS-specific restrictions may apply when oldpath and newpath are in different directories. If there is an error, it will be of type *LinkError.

func SameFile

func SameFile(fi1, fi2 FileInfo) bool

SameFile reports whether fi1 and fi2 describe the same file. For example, on Unix this means that the device and inode fields of the two underlying structures are identical; on other systems the decision may be based on the path names. SameFile only applies to results returned by this package's Stat. It returns false in other cases.

func Setenv

func Setenv(key, value string) error

Setenv sets the value of the environment variable named by the key. It returns an error, if any.

func Symlink(oldname, newname string) error

Symlink creates newname as a symbolic link to oldname. If there is an error, it will be of type *LinkError.

func TempDir

func TempDir() string

TempDir returns the default directory to use for temporary files.

On Unix systems, it returns $TMPDIR if non-empty, else /tmp. On Windows, it uses GetTempPath, returning the first non-empty value from %TMP%, %TEMP%, %USERPROFILE%, or the Windows directory. On Plan 9, it returns /tmp.

The directory is neither guaranteed to exist nor have accessible permissions.

func Truncate

func Truncate(name string, size int64) error

Truncate changes the size of the named file. If the file is a symbolic link, it changes the size of the link's target. If there is an error, it will be of type *PathError.

func Unsetenv

func Unsetenv(key string) error

Unsetenv unsets a single environment variable.

Example
package main

import (
	"os"
)

func main() {
	os.Setenv("TMPDIR", "/my/tmp")
	defer os.Unsetenv("TMPDIR")
}
Output:

func UserCacheDir

func UserCacheDir() (string, error)

UserCacheDir returns the default root directory to use for user-specific cached data. Users should create their own application-specific subdirectory within this one and use that.

On Unix systems, it returns $XDG_CACHE_HOME as specified by https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html if non-empty, else $HOME/.cache. On Darwin, it returns $HOME/Library/Caches. On Windows, it returns %LocalAppData%. On Plan 9, it returns $home/lib/cache.

If the location cannot be determined (for example, $HOME is not defined), then it will return an error.

Types

type File

type File struct {
	// contains filtered or unexported fields
}

File represents an open file descriptor.

func Create

func Create(name string) (*File, error)

Create creates the named file with mode 0666 (before umask), truncating it if it already exists. If successful, methods on the returned File can be used for I/O; the associated file descriptor has mode O_RDWR. If there is an error, it will be of type *PathError.

func NewFile

func NewFile(fd uintptr, name string) *File

NewFile returns a new File with the given file descriptor and name. The returned value will be nil if fd is not a valid file descriptor. On Unix systems, if the file descriptor is in non-blocking mode, NewFile will attempt to return a pollable File (one for which the SetDeadline methods work).

func Open

func Open(name string) (*File, error)

Open opens the named file for reading. If successful, methods on the returned file can be used for reading; the associated file descriptor has mode O_RDONLY. If there is an error, it will be of type *PathError.

func OpenFile

func OpenFile(name string, flag int, perm FileMode) (*File, error)

OpenFile is the generalized open call; most users will use Open or Create instead. It opens the named file with specified flag (O_RDONLY etc.) and perm (before umask), if applicable. If successful, methods on the returned File can be used for I/O. If there is an error, it will be of type *PathError.

Example
package main

import (
	"log"
	"os"
)

func main() {
	f, err := os.OpenFile("notes.txt", os.O_RDWR|os.O_CREATE, 0755)
	if err != nil {
		log.Fatal(err)
	}
	if err := f.Close(); err != nil {
		log.Fatal(err)
	}
}
Output:

Example (Append)
package main

import (
	"log"
	"os"
)

func main() {
	// If the file doesn't exist, create it, or append to the file
	f, err := os.OpenFile("access.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Fatal(err)
	}
	if _, err := f.Write([]byte("appended some data\n")); err != nil {
		log.Fatal(err)
	}
	if err := f.Close(); err != nil {
		log.Fatal(err)
	}
}
Output:

func (*File) Chdir

func (f *File) Chdir() error

Chdir changes the current working directory to the file, which must be a directory. If there is an error, it will be of type *PathError.

func (*File) Chmod

func (f *File) Chmod(mode FileMode) error

Chmod changes the mode of the file to mode. If there is an error, it will be of type *PathError.

func (*File) Chown

func (f *File) Chown(uid, gid int) error

Chown changes the numeric uid and gid of the named file. If there is an error, it will be of type *PathError.

On Windows, it always returns the syscall.EWINDOWS error, wrapped in *PathError.

func (*File) Close

func (f *File) Close() error

Close closes the File, rendering it unusable for I/O. On files that support SetDeadline, any pending I/O operations will be canceled and return immediately with an error.

func (*File) Fd

func (f *File) Fd() uintptr

Fd returns the integer Unix file descriptor referencing the open file. The file descriptor is valid only until f.Close is called or f is garbage collected. On Unix systems this will cause the SetDeadline methods to stop working.

func (*File) Name

func (f *File) Name() string

Name returns the name of the file as presented to Open.

func (*File) Read

func (f *File) Read(b []byte) (n int, err error)

Read reads up to len(b) bytes from the File. It returns the number of bytes read and any error encountered. At end of file, Read returns 0, io.EOF.

func (*File) ReadAt

func (f *File) ReadAt(b []byte, off int64) (n int, err error)

ReadAt reads len(b) bytes from the File starting at byte offset off. It returns the number of bytes read and the error, if any. ReadAt always returns a non-nil error when n < len(b). At end of file, that error is io.EOF.

func (*File) Readdir

func (f *File) Readdir(n int) ([]FileInfo, error)

Readdir reads the contents of the directory associated with file and returns a slice of up to n FileInfo values, as would be returned by Lstat, in directory order. Subsequent calls on the same file will yield further FileInfos.

If n > 0, Readdir returns at most n FileInfo structures. In this case, if Readdir returns an empty slice, it will return a non-nil error explaining why. At the end of a directory, the error is io.EOF.

If n <= 0, Readdir returns all the FileInfo from the directory in a single slice. In this case, if Readdir succeeds (reads all the way to the end of the directory), it returns the slice and a nil error. If it encounters an error before the end of the directory, Readdir returns the FileInfo read until that point and a non-nil error.

func (*File) Readdirnames

func (f *File) Readdirnames(n int) (names []string, err error)

Readdirnames reads and returns a slice of names from the directory f.

If n > 0, Readdirnames returns at most n names. In this case, if Readdirnames returns an empty slice, it will return a non-nil error explaining why. At the end of a directory, the error is io.EOF.

If n <= 0, Readdirnames returns all the names from the directory in a single slice. In this case, if Readdirnames succeeds (reads all the way to the end of the directory), it returns the slice and a nil error. If it encounters an error before the end of the directory, Readdirnames returns the names read until that point and a non-nil error.

func (*File) Seek

func (f *File) Seek(offset int64, whence int) (ret int64, err error)

Seek sets the offset for the next Read or Write on file to offset, interpreted according to whence: 0 means relative to the origin of the file, 1 means relative to the current offset, and 2 means relative to the end. It returns the new offset and an error, if any. The behavior of Seek on a file opened with O_APPEND is not specified.

func (*File) SetDeadline

func (f *File) SetDeadline(t time.Time) error

SetDeadline sets the read and write deadlines for a File. It is equivalent to calling both SetReadDeadline and SetWriteDeadline.

Only some kinds of files support setting a deadline. Calls to SetDeadline for files that do not support deadlines will return ErrNoDeadline. On most systems ordinary files do not support deadlines, but pipes do.

A deadline is an absolute time after which I/O operations fail with an error instead of blocking. The deadline applies to all future and pending I/O, not just the immediately following call to Read or Write. After a deadline has been exceeded, the connection can be refreshed by setting a deadline in the future.

An error returned after a timeout fails will implement the Timeout method, and calling the Timeout method will return true. The PathError and SyscallError types implement the Timeout method. In general, call IsTimeout to test whether an error indicates a timeout.

An idle timeout can be implemented by repeatedly extending the deadline after successful Read or Write calls.

A zero value for t means I/O operations will not time out.

func (*File) SetReadDeadline

func (f *File) SetReadDeadline(t time.Time) error

SetReadDeadline sets the deadline for future Read calls and any currently-blocked Read call. A zero value for t means Read will not time out. Not all files support setting deadlines; see SetDeadline.

func (*File) SetWriteDeadline

func (f *File) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the deadline for any future Write calls and any currently-blocked Write call. Even if Write times out, it may return n > 0, indicating that some of the data was successfully written. A zero value for t means Write will not time out. Not all files support setting deadlines; see SetDeadline.

func (*File) Stat

func (f *File) Stat() (FileInfo, error)

Stat returns the FileInfo structure describing file. If there is an error, it will be of type *PathError.

func (*File) Sync

func (f *File) Sync() error

Sync commits the current contents of the file to stable storage. Typically, this means flushing the file system's in-memory copy of recently written data to disk.

func (*File) Truncate

func (f *File) Truncate(size int64) error

Truncate changes the size of the file. It does not change the I/O offset. If there is an error, it will be of type *PathError.

func (*File) Write

func (f *File) Write(b []byte) (n int, err error)

Write writes len(b) bytes to the File. It returns the number of bytes written and an error, if any. Write returns a non-nil error when n != len(b).

func (*File) WriteAt

func (f *File) WriteAt(b []byte, off int64) (n int, err error)

WriteAt writes len(b) bytes to the File starting at byte offset off. It returns the number of bytes written and an error, if any. WriteAt returns a non-nil error when n != len(b).

func (*File) WriteString

func (f *File) WriteString(s string) (n int, err error)

WriteString is like Write, but writes the contents of string s rather than a slice of bytes.

type FileInfo

type FileInfo interface {
	Name() string       // base name of the file
	Size() int64        // length in bytes for regular files; system-dependent for others
	Mode() FileMode     // file mode bits
	ModTime() time.Time // modification time
	IsDir() bool        // abbreviation for Mode().IsDir()
	Sys() interface{}   // underlying data source (can return nil)
}

A FileInfo describes a file and is returned by Stat and Lstat.

func Lstat

func Lstat(name string) (FileInfo, error)

Lstat returns a FileInfo describing the named file. If the file is a symbolic link, the returned FileInfo describes the symbolic link. Lstat makes no attempt to follow the link. If there is an error, it will be of type *PathError.

func Stat

func Stat(name string) (FileInfo, error)

Stat returns a FileInfo describing the named file. If there is an error, it will be of type *PathError.

type FileMode

type FileMode uint32

A FileMode represents a file's mode and permission bits. The bits have the same definition on all systems, so that information about files can be moved from one system to another portably. Not all bits apply to all systems. The only required bit is ModeDir for directories.

Example
package main

import (
	"fmt"
	"log"
	"os"
)

func main() {
	fi, err := os.Lstat("some-filename")
	if err != nil {
		log.Fatal(err)
	}

	switch mode := fi.Mode(); {
	case mode.IsRegular():
		fmt.Println("regular file")
	case mode.IsDir():
		fmt.Println("directory")
	case mode&os.ModeSymlink != 0:
		fmt.Println("symbolic link")
	case mode&os.ModeNamedPipe != 0:
		fmt.Println("named pipe")
	}
}
Output:

const (
	// The single letters are the abbreviations
	// used by the String method's formatting.
	ModeDir        FileMode = 1 << (32 - 1 - iota) // d: is a directory
	ModeAppend                                     // a: append-only
	ModeExclusive                                  // l: exclusive use
	ModeTemporary                                  // T: temporary file; Plan 9 only
	ModeSymlink                                    // L: symbolic link
	ModeDevice                                     // D: device file
	ModeNamedPipe                                  // p: named pipe (FIFO)
	ModeSocket                                     // S: Unix domain socket
	ModeSetuid                                     // u: setuid
	ModeSetgid                                     // g: setgid
	ModeCharDevice                                 // c: Unix character device, when ModeDevice is set
	ModeSticky                                     // t: sticky
	ModeIrregular                                  // ?: non-regular file; nothing else is known about this file

	// Mask for the type bits. For regular files, none will be set.
	ModeType = ModeDir | ModeSymlink | ModeNamedPipe | ModeSocket | ModeDevice | ModeIrregular

	ModePerm FileMode = 0777 // Unix permission bits
)

The defined file mode bits are the most significant bits of the FileMode. The nine least-significant bits are the standard Unix rwxrwxrwx permissions. The values of these bits should be considered part of the public API and may be used in wire protocols or disk representations: they must not be changed, although new bits might be added.

func (FileMode) IsDir

func (m FileMode) IsDir() bool

IsDir reports whether m describes a directory. That is, it tests for the ModeDir bit being set in m.

func (FileMode) IsRegular

func (m FileMode) IsRegular() bool

IsRegular reports whether m describes a regular file. That is, it tests that no mode type bits are set.

func (FileMode) Perm

func (m FileMode) Perm() FileMode

Perm returns the Unix permission bits in m.

func (FileMode) String

func (m FileMode) String() string

type LinkError

type LinkError struct {
	Op  string
	Old string
	New string
	Err error
}

LinkError records an error during a link or symlink or rename system call and the paths that caused it.

func (*LinkError) Error

func (e *LinkError) Error() string

type PathError

type PathError struct {
	Op   string
	Path string
	Err  error
}

PathError records an error and the operation and file path that caused it.

func (*PathError) Error

func (e *PathError) Error() string

func (*PathError) Timeout

func (e *PathError) Timeout() bool

Timeout reports whether this error represents a timeout.

type ProcAttr

type ProcAttr struct {
	// If Dir is non-empty, the child changes into the directory before
	// creating the process.
	Dir string
	// If Env is non-nil, it gives the environment variables for the
	// new process in the form returned by Environ.
	// If it is nil, the result of Environ will be used.
	Env []string
	// Files specifies the open files inherited by the new process. The
	// first three entries correspond to standard input, standard output, and
	// standard error. An implementation may support additional entries,
	// depending on the underlying operating system. A nil entry corresponds
	// to that file being closed when the process starts.
	Files []*File

	// Operating system-specific process creation attributes.
	// Note that setting this field means that your program
	// may not execute properly or even compile on some
	// operating systems.
	Sys *syscall.SysProcAttr
}

ProcAttr holds the attributes that will be applied to a new process started by StartProcess.

type Process

type Process struct {
	Pid int
	// contains filtered or unexported fields
}

Process stores the information about a process created by StartProcess.

func FindProcess

func FindProcess(pid int) (*Process, error)

FindProcess looks for a running process by its pid.

The Process it returns can be used to obtain information about the underlying operating system process.

On Unix systems, FindProcess always succeeds and returns a Process for the given pid, regardless of whether the process exists.

func StartProcess

func StartProcess(name string, argv []string, attr *ProcAttr) (*Process, error)

StartProcess starts a new process with the program, arguments and attributes specified by name, argv and attr. The argv slice will become os.Args in the new process, so it normally starts with the program name.

If the calling goroutine has locked the operating system thread with runtime.LockOSThread and modified any inheritable OS-level thread state (for example, Linux or Plan 9 name spaces), the new process will inherit the caller's thread state.

StartProcess is a low-level interface. The os/exec package provides higher-level interfaces.

If there is an error, it will be of type *PathError.

func (*Process) Kill

func (p *Process) Kill() error

Kill causes the Process to exit immediately. Kill does not wait until the Process has actually exited. This only kills the Process itself, not any other processes it may have started.

func (*Process) Release

func (p *Process) Release() error

Release releases any resources associated with the Process p, rendering it unusable in the future. Release only needs to be called if Wait is not.

func (*Process) Signal

func (p *Process) Signal(sig Signal) error

Signal sends a signal to the Process. Sending Interrupt on Windows is not implemented.

func (*Process) Wait

func (p *Process) Wait() (*ProcessState, error)

Wait waits for the Process to exit, and then returns a ProcessState describing its status and an error, if any. Wait releases any resources associated with the Process. On most operating systems, the Process must be a child of the current process or an error will be returned.

type ProcessState

type ProcessState struct {
	// contains filtered or unexported fields
}

ProcessState stores information about a process, as reported by Wait.

func (*ProcessState) Exited

func (p *ProcessState) Exited() bool

Exited reports whether the program has exited.

func (*ProcessState) Pid

func (p *ProcessState) Pid() int

Pid returns the process id of the exited process.

func (*ProcessState) String

func (p *ProcessState) String() string

func (*ProcessState) Success

func (p *ProcessState) Success() bool

Success reports whether the program exited successfully, such as with exit status 0 on Unix.

func (*ProcessState) Sys

func (p *ProcessState) Sys() interface{}

Sys returns system-dependent exit information about the process. Convert it to the appropriate underlying type, such as syscall.WaitStatus on Unix, to access its contents.

func (*ProcessState) SysUsage

func (p *ProcessState) SysUsage() interface{}

SysUsage returns system-dependent resource usage information about the exited process. Convert it to the appropriate underlying type, such as *syscall.Rusage on Unix, to access its contents. (On Unix, *syscall.Rusage matches struct rusage as defined in the getrusage(2) manual page.)

func (*ProcessState) SystemTime

func (p *ProcessState) SystemTime() time.Duration

SystemTime returns the system CPU time of the exited process and its children.

func (*ProcessState) UserTime

func (p *ProcessState) UserTime() time.Duration

UserTime returns the user CPU time of the exited process and its children.

type Signal

type Signal interface {
	String() string
	Signal() // to distinguish from other Stringers
}

A Signal represents an operating system signal. The usual underlying implementation is operating system-dependent: on Unix it is syscall.Signal.

var (
	Interrupt Signal = syscall.SIGINT
	Kill      Signal = syscall.SIGKILL
)

The only signal values guaranteed to be present in the os package on all systems are Interrupt (send the process an interrupt) and Kill (force the process to exit). Interrupt is not implemented on Windows; using it with os.Process.Signal will return an error.

type SyscallError

type SyscallError struct {
	Syscall string
	Err     error
}

SyscallError records an error from a specific system call.

func (*SyscallError) Error

func (e *SyscallError) Error() string

func (*SyscallError) Timeout

func (e *SyscallError) Timeout() bool

Timeout reports whether this error represents a timeout.

Directories

Path Synopsis
Package exec runs external commands.
Package exec runs external commands.
Package signal implements access to incoming signals.
Package signal implements access to incoming signals.
internal/pty
Package pty is a simple pseudo-terminal package for Unix systems, implemented by calling C functions via cgo.
Package pty is a simple pseudo-terminal package for Unix systems, implemented by calling C functions via cgo.
Package user allows user account lookups by name or id.
Package user allows user account lookups by name or id.

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