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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
// Fork, exec, wait, etc.
package syscall
import (
"runtime"
"sync"
"unsafe"
)
// Lock synchronizing creation of new file descriptors with fork.
//
// We want the child in a fork/exec sequence to inherit only the
// file descriptors we intend. To do that, we mark all file
// descriptors close-on-exec and then, in the child, explicitly
// unmark the ones we want the exec'ed program to keep.
// Unix doesn't make this easy: there is, in general, no way to
// allocate a new file descriptor close-on-exec. Instead you
// have to allocate the descriptor and then mark it close-on-exec.
// If a fork happens between those two events, the child's exec
// will inherit an unwanted file descriptor.
//
// This lock solves that race: the create new fd/mark close-on-exec
// operation is done holding ForkLock for reading, and the fork itself
// is done holding ForkLock for writing. At least, that's the idea.
// There are some complications.
//
// Some system calls that create new file descriptors can block
// for arbitrarily long times: open on a hung NFS server or named
// pipe, accept on a socket, and so on. We can't reasonably grab
// the lock across those operations.
//
// It is worse to inherit some file descriptors than others.
// If a non-malicious child accidentally inherits an open ordinary file,
// that's not a big deal. On the other hand, if a long-lived child
// accidentally inherits the write end of a pipe, then the reader
// of that pipe will not see EOF until that child exits, potentially
// causing the parent program to hang. This is a common problem
// in threaded C programs that use popen.
//
// Luckily, the file descriptors that are most important not to
// inherit are not the ones that can take an arbitrarily long time
// to create: pipe returns instantly, and the net package uses
// non-blocking I/O to accept on a listening socket.
// The rules for which file descriptor-creating operations use the
// ForkLock are as follows:
//
// 1) Pipe. Does not block. Use the ForkLock.
// 2) Socket. Does not block. Use the ForkLock.
// 3) Accept. If using non-blocking mode, use the ForkLock.
// Otherwise, live with the race.
// 4) Open. Can block. Use O_CLOEXEC if available (Linux).
// Otherwise, live with the race.
// 5) Dup. Does not block. Use the ForkLock.
// On Linux, could use fcntl F_DUPFD_CLOEXEC
// instead of the ForkLock, but only for dup(fd, -1).
var ForkLock sync.RWMutex
// StringSlicePtr is deprecated. Use SlicePtrFromStrings instead.
// If any string contains a NUL byte this function panics instead
// of returning an error.
func StringSlicePtr(ss []string) []*byte {
bb := make([]*byte, len(ss)+1)
for i := 0; i < len(ss); i++ {
bb[i] = StringBytePtr(ss[i])
}
bb[len(ss)] = nil
return bb
}
// SlicePtrFromStrings converts a slice of strings to a slice of
// pointers to NUL-terminated byte slices. If any string contains
// a NUL byte, it returns (nil, EINVAL).
func SlicePtrFromStrings(ss []string) ([]*byte, error) {
var err error
bb := make([]*byte, len(ss)+1)
for i := 0; i < len(ss); i++ {
bb[i], err = BytePtrFromString(ss[i])
if err != nil {
return nil, err
}
}
bb[len(ss)] = nil
return bb, nil
}
func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
func SetNonblock(fd int, nonblocking bool) (err error) {
flag, err := fcntl(fd, F_GETFL, 0)
if err != nil {
return err
}
if nonblocking {
flag |= O_NONBLOCK
} else {
flag &= ^O_NONBLOCK
}
_, err = fcntl(fd, F_SETFL, flag)
return err
}
// Credential holds user and group identities to be assumed
// by a child process started by StartProcess.
type Credential struct {
Uid uint32 // User ID.
Gid uint32 // Group ID.
Groups []uint32 // Supplementary group IDs.
}
// ProcAttr holds attributes that will be applied to a new process started
// by StartProcess.
type ProcAttr struct {
Dir string // Current working directory.
Env []string // Environment.
Files []uintptr // File descriptors.
Sys *SysProcAttr
}
var zeroProcAttr ProcAttr
var zeroSysProcAttr SysProcAttr
func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
var p [2]int
var n int
var err1 Errno
var wstatus WaitStatus
if attr == nil {
attr = &zeroProcAttr
}
sys := attr.Sys
if sys == nil {
sys = &zeroSysProcAttr
}
p[0] = -1
p[1] = -1
// Convert args to C form.
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return 0, err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return 0, err
}
envvp, err := SlicePtrFromStrings(attr.Env)
if err != nil {
return 0, err
}
if (runtime.GOOS == "freebsd" || runtime.GOOS == "dragonfly") && len(argv[0]) > len(argv0) {
argvp[0] = argv0p
}
var chroot *byte
if sys.Chroot != "" {
chroot, err = BytePtrFromString(sys.Chroot)
if err != nil {
return 0, err
}
}
var dir *byte
if attr.Dir != "" {
dir, err = BytePtrFromString(attr.Dir)
if err != nil {
return 0, err
}
}
// Acquire the fork lock so that no other threads
// create new fds that are not yet close-on-exec
// before we fork.
ForkLock.Lock()
// Allocate child status pipe close on exec.
if err = forkExecPipe(p[:]); err != nil {
goto error
}
// Kick off child.
pid, err1 = forkAndExecInChild(argv0p, argvp, envvp, chroot, dir, attr, sys, p[1])
if err1 != 0 {
err = Errno(err1)
goto error
}
ForkLock.Unlock()
// Read child error status from pipe.
Close(p[1])
n, err = readlen(p[0], (*byte)(unsafe.Pointer(&err1)), int(unsafe.Sizeof(err1)))
Close(p[0])
if err != nil || n != 0 {
if n == int(unsafe.Sizeof(err1)) {
err = Errno(err1)
}
if err == nil {
err = EPIPE
}
// Child failed; wait for it to exit, to make sure
// the zombies don't accumulate.
_, err1 := Wait4(pid, &wstatus, 0, nil)
for err1 == EINTR {
_, err1 = Wait4(pid, &wstatus, 0, nil)
}
return 0, err
}
// Read got EOF, so pipe closed on exec, so exec succeeded.
return pid, nil
error:
if p[0] >= 0 {
Close(p[0])
Close(p[1])
}
ForkLock.Unlock()
return 0, err
}
// Combination of fork and exec, careful to be thread safe.
func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) {
return forkExec(argv0, argv, attr)
}
// StartProcess wraps ForkExec for package os.
func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
pid, err = forkExec(argv0, argv, attr)
return pid, 0, err
}
// Ordinary exec.
func Exec(argv0 string, argv []string, envv []string) (err error) {
argv0p, err := BytePtrFromString(argv0)
if err != nil {
return err
}
argvp, err := SlicePtrFromStrings(argv)
if err != nil {
return err
}
envvp, err := SlicePtrFromStrings(envv)
if err != nil {
return err
}
_, _, err1 := RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0p)),
uintptr(unsafe.Pointer(&argvp[0])),
uintptr(unsafe.Pointer(&envvp[0])))
return Errno(err1)
}