Gecko [ 167.86.127.34 ]

Name	Size	Permission
js	[ DIR ]	drwxr-xr-x
asm9_unix1_amd64.s	1.02 KB	-rw-r--r--
asm9_unix2_amd64.s	1.2 KB	-rw-r--r--
asm_aix_ppc64.s	540 B	-rw-r--r--
asm_darwin_386.s	2.5 KB	-rw-r--r--
asm_darwin_amd64.s	2.82 KB	-rw-r--r--
asm_darwin_arm.s	2.81 KB	-rw-r--r--
asm_darwin_arm64.s	2.71 KB	-rw-r--r--
asm_freebsd_arm.s	2.96 KB	-rw-r--r--
asm_freebsd_arm64.s	2.68 KB	-rw-r--r--
asm_linux_386.s	4.67 KB	-rw-r--r--
asm_linux_amd64.s	3.21 KB	-rw-r--r--
asm_linux_arm.s	3.63 KB	-rw-r--r--
asm_linux_arm64.s	2.73 KB	-rw-r--r--
asm_linux_mips64x.s	2.28 KB	-rw-r--r--
asm_linux_mipsx.s	3.28 KB	-rw-r--r--
asm_linux_ppc64x.s	2.66 KB	-rw-r--r--
asm_linux_riscv64.s	2.46 KB	-rw-r--r--
asm_linux_s390x.s	4.19 KB	-rw-r--r--
asm_netbsd_arm.s	2.85 KB	-rw-r--r--
asm_netbsd_arm64.s	2.77 KB	-rw-r--r--
asm_openbsd_arm.s	3.22 KB	-rw-r--r--
asm_openbsd_arm64.s	2.49 KB	-rw-r--r--
asm_plan9_386.s	3.14 KB	-rw-r--r--
asm_plan9_amd64.s	3.06 KB	-rw-r--r--
asm_plan9_arm.s	3.25 KB	-rw-r--r--
asm_solaris_amd64.s	1.79 KB	-rw-r--r--
asm_unix_386.s	2.74 KB	-rw-r--r--
asm_unix_amd64.s	2.08 KB	-rw-r--r--
asm_windows.s	384 B	-rw-r--r--
bpf_bsd.go	4.61 KB	-rw-r--r--
bpf_darwin.go	3.97 KB	-rw-r--r--
const_plan9.go	1.2 KB	-rw-r--r--
creds_test.go	3.26 KB	-rw-r--r--
dir_plan9.go	5.62 KB	-rw-r--r--
dirent.go	3 KB	-rw-r--r--
dirent_test.go	3.28 KB	-rw-r--r--
dll_windows.go	9.72 KB	-rw-r--r--
endian_big.go	239 B	-rw-r--r--
endian_little.go	273 B	-rw-r--r--
env_plan9.go	2.15 KB	-rw-r--r--
env_unix.go	2.77 KB	-rw-r--r--
env_windows.go	1.75 KB	-rw-r--r--
errors_plan9.go	1.61 KB	-rw-r--r--
exec_aix_test.go	816 B	-rw-r--r--
exec_bsd.go	6.36 KB	-rw-r--r--
exec_darwin.go	6.76 KB	-rw-r--r--
exec_libc.go	6.96 KB	-rw-r--r--
exec_linux.go	18.34 KB	-rw-r--r--
exec_linux_test.go	18.81 KB	-rw-r--r--
exec_plan9.go	13.19 KB	-rw-r--r--
exec_solaris_test.go	808 B	-rw-r--r--
exec_unix.go	8.13 KB	-rw-r--r--
exec_unix_test.go	3.89 KB	-rw-r--r--
exec_windows.go	7.64 KB	-rw-r--r--
export_freebsd_test.go	304 B	-rw-r--r--
export_linux_test.go	252 B	-rw-r--r--
export_test.go	193 B	-rw-r--r--
export_unix_test.go	341 B	-rw-r--r--
flock.go	691 B	-rw-r--r--
flock_aix.go	564 B	-rw-r--r--
flock_darwin.go	405 B	-rw-r--r--
flock_linux_32bit.go	481 B	-rw-r--r--
forkpipe.go	501 B	-rw-r--r--
forkpipe2.go	276 B	-rw-r--r--
fs_js.go	10.46 KB	-rw-r--r--
getdirentries_test.go	2.18 KB	-rw-r--r--
lsf_linux.go	2.12 KB	-rw-r--r--
mkall.sh	12.49 KB	-rwxr-xr-x
mkasm_darwin.go	1.66 KB	-rw-r--r--
mkerrors.sh	10.65 KB	-rwxr-xr-x
mkpost.go	1.99 KB	-rw-r--r--
mksyscall.pl	9.52 KB	-rwxr-xr-x
mksyscall_libc.pl	7.8 KB	-rwxr-xr-x
mksyscall_windows.go	707 B	-rw-r--r--
mksysctl_openbsd.pl	5.04 KB	-rwxr-xr-x
mksysnum_darwin.pl	578 B	-rwxr-xr-x
mksysnum_dragonfly.pl	866 B	-rwxr-xr-x
mksysnum_freebsd.pl	1.35 KB	-rwxr-xr-x
mksysnum_linux.pl	1.26 KB	-rwxr-xr-x
mksysnum_netbsd.pl	1.01 KB	-rwxr-xr-x
mksysnum_openbsd.pl	871 B	-rwxr-xr-x
mksysnum_plan9.sh	459 B	-rwxr-xr-x
mmap_unix_test.go	544 B	-rw-r--r--
msan.go	409 B	-rw-r--r--
msan0.go	341 B	-rw-r--r--
net.go	1.19 KB	-rw-r--r--
net_js.go	2.11 KB	-rw-r--r--
netlink_linux.go	4.67 KB	-rw-r--r--
pwd_plan9.go	1.55 KB	-rw-r--r--
route_bsd.go	9.09 KB	-rw-r--r--
route_darwin.go	2.01 KB	-rw-r--r--
route_dragonfly.go	2.61 KB	-rw-r--r--
route_freebsd.go	2.67 KB	-rw-r--r--
route_freebsd_32bit.go	1.29 KB	-rw-r--r--
route_freebsd_64bit.go	724 B	-rw-r--r--
route_netbsd.go	1.43 KB	-rw-r--r--
route_openbsd.go	1.46 KB	-rw-r--r--
security_windows.go	10.12 KB	-rw-r--r--
setuidgid_32_linux.go	306 B	-rw-r--r--
setuidgid_linux.go	302 B	-rw-r--r--
sock_cloexec_linux.go	632 B	-rw-r--r--
sockcmsg_dragonfly.go	547 B	-rw-r--r--
sockcmsg_linux.go	1.12 KB	-rw-r--r--
sockcmsg_unix.go	2.56 KB	-rw-r--r--
sockcmsg_unix_other.go	957 B	-rw-r--r--
str.go	549 B	-rw-r--r--
syscall.go	3.72 KB	-rw-r--r--
syscall_aix.go	17.83 KB	-rw-r--r--
syscall_aix_ppc64.go	405 B	-rw-r--r--
syscall_bsd.go	14.07 KB	-rw-r--r--
syscall_bsd_test.go	1.16 KB	-rw-r--r--
syscall_darwin.go	14.26 KB	-rw-r--r--
syscall_darwin_386.go	2 KB	-rw-r--r--
syscall_darwin_amd64.go	1.92 KB	-rw-r--r--
syscall_darwin_arm.go	2.03 KB	-rw-r--r--
syscall_darwin_arm64.go	1.98 KB	-rw-r--r--
syscall_dragonfly.go	7.98 KB	-rw-r--r--
syscall_dragonfly_amd64.go	1.12 KB	-rw-r--r--
syscall_freebsd.go	15.82 KB	-rw-r--r--
syscall_freebsd_386.go	1.17 KB	-rw-r--r--
syscall_freebsd_amd64.go	1.12 KB	-rw-r--r--
syscall_freebsd_arm.go	1.16 KB	-rw-r--r--
syscall_freebsd_arm64.go	1.12 KB	-rw-r--r--
syscall_freebsd_test.go	1.35 KB	-rw-r--r--
syscall_getwd_bsd.go	453 B	-rw-r--r--
syscall_js.go	6.59 KB	-rw-r--r--
syscall_linux.go	26.05 KB	-rw-r--r--
syscall_linux_386.go	10.91 KB	-rw-r--r--
syscall_linux_amd64.go	5.39 KB	-rw-r--r--
syscall_linux_arm.go	7.47 KB	-rw-r--r--
syscall_linux_arm64.go	6.24 KB	-rw-r--r--
syscall_linux_mips64x.go	6.58 KB	-rw-r--r--
syscall_linux_mipsx.go	7.03 KB	-rw-r--r--
syscall_linux_ppc64x.go	5.21 KB	-rw-r--r--
syscall_linux_riscv64.go	6.4 KB	-rw-r--r--
syscall_linux_s390x.go	8.64 KB	-rw-r--r--
syscall_linux_test.go	10.61 KB	-rw-r--r--
syscall_netbsd.go	7.59 KB	-rw-r--r--
syscall_netbsd_386.go	716 B	-rw-r--r--
syscall_netbsd_amd64.go	709 B	-rw-r--r--
syscall_netbsd_arm.go	716 B	-rw-r--r--
syscall_netbsd_arm64.go	709 B	-rw-r--r--
syscall_openbsd.go	7.06 KB	-rw-r--r--
syscall_openbsd_386.go	715 B	-rw-r--r--
syscall_openbsd_amd64.go	701 B	-rw-r--r--
syscall_openbsd_arm.go	715 B	-rw-r--r--
syscall_openbsd_arm64.go	906 B	-rw-r--r--
syscall_plan9.go	8.94 KB	-rw-r--r--
syscall_plan9_test.go	1.15 KB	-rw-r--r--
syscall_ptrace_test.go	752 B	-rw-r--r--
syscall_solaris.go	15.07 KB	-rw-r--r--
syscall_solaris_amd64.go	487 B	-rw-r--r--
syscall_test.go	1.7 KB	-rw-r--r--
syscall_unix.go	8.3 KB	-rw-r--r--
syscall_unix_test.go	10.61 KB	-rw-r--r--
syscall_windows.go	42.54 KB	-rw-r--r--
syscall_windows_386.go	176 B	-rw-r--r--
syscall_windows_amd64.go	176 B	-rw-r--r--
syscall_windows_test.go	1.8 KB	-rw-r--r--
tables_js.go	19.17 KB	-rw-r--r--
time_fake.go	676 B	-rw-r--r--
time_nofake.go	350 B	-rw-r--r--
timestruct.go	1.13 KB	-rw-r--r--
types_aix.go	3.35 KB	-rw-r--r--
types_darwin.go	4.98 KB	-rw-r--r--
types_dragonfly.go	5.04 KB	-rw-r--r--
types_freebsd.go	6.96 KB	-rw-r--r--
types_linux.go	10.68 KB	-rw-r--r--
types_netbsd.go	4.77 KB	-rw-r--r--
types_openbsd.go	5.04 KB	-rw-r--r--
types_solaris.go	4.88 KB	-rw-r--r--
types_windows.go	26.96 KB	-rw-r--r--
types_windows_386.go	477 B	-rw-r--r--
types_windows_amd64.go	477 B	-rw-r--r--
types_windows_arm.go	477 B	-rw-r--r--
zerrors_aix_ppc64.go	47.16 KB	-rw-r--r--
zerrors_darwin_386.go	55.27 KB	-rw-r--r--
zerrors_darwin_amd64.go	55.27 KB	-rw-r--r--
zerrors_darwin_arm.go	46.08 KB	-rw-r--r--
zerrors_darwin_arm64.go	55.78 KB	-rw-r--r--
zerrors_dragonfly_amd64.go	59.49 KB	-rw-r--r--
zerrors_freebsd_386.go	67.35 KB	-rw-r--r--
zerrors_freebsd_amd64.go	67.4 KB	-rw-r--r--
zerrors_freebsd_arm.go	67.34 KB	-rw-r--r--
zerrors_freebsd_arm64.go	67.41 KB	-rw-r--r--
zerrors_linux_386.go	58.31 KB	-rw-r--r--
zerrors_linux_amd64.go	58.35 KB	-rw-r--r--
zerrors_linux_arm.go	58.83 KB	-rw-r--r--
zerrors_linux_arm64.go	69.52 KB	-rw-r--r--
zerrors_linux_mips.go	70.14 KB	-rw-r--r--
zerrors_linux_mips64.go	69.46 KB	-rw-r--r--
zerrors_linux_mips64le.go	69.46 KB	-rw-r--r--
zerrors_linux_mipsle.go	70.14 KB	-rw-r--r--
zerrors_linux_ppc64.go	71.84 KB	-rw-r--r--
zerrors_linux_ppc64le.go	72.8 KB	-rw-r--r--
zerrors_linux_riscv64.go	71.76 KB	-rw-r--r--
zerrors_linux_s390x.go	74.28 KB	-rw-r--r--
zerrors_netbsd_386.go	67.43 KB	-rw-r--r--
zerrors_netbsd_amd64.go	67.02 KB	-rw-r--r--
zerrors_netbsd_arm.go	66.45 KB	-rw-r--r--
zerrors_netbsd_arm64.go	67.02 KB	-rw-r--r--
zerrors_openbsd_386.go	62.47 KB	-rw-r--r--
zerrors_openbsd_amd64.go	62.43 KB	-rw-r--r--
zerrors_openbsd_arm.go	62.46 KB	-rw-r--r--
zerrors_openbsd_arm64.go	66.36 KB	-rw-r--r--
zerrors_solaris_amd64.go	50.71 KB	-rw-r--r--
zerrors_windows.go	9.97 KB	-rw-r--r--
zerrors_windows_386.go	176 B	-rw-r--r--
zerrors_windows_amd64.go	176 B	-rw-r--r--
zsyscall_aix_ppc64.go	40.02 KB	-rw-r--r--
zsyscall_darwin_386.go	53.97 KB	-rw-r--r--
zsyscall_darwin_386.s	8.65 KB	-rw-r--r--
zsyscall_darwin_amd64.go	53.83 KB	-rw-r--r--
zsyscall_darwin_amd64.s	8.65 KB	-rw-r--r--
zsyscall_darwin_arm.go	53.44 KB	-rw-r--r--
zsyscall_darwin_arm.s	8.56 KB	-rw-r--r--
zsyscall_darwin_arm64.go	53.3 KB	-rw-r--r--
zsyscall_darwin_arm64.s	8.56 KB	-rw-r--r--
zsyscall_dragonfly_amd64.go	30.9 KB	-rw-r--r--
zsyscall_freebsd_386.go	33.55 KB	-rw-r--r--
zsyscall_freebsd_amd64.go	33.41 KB	-rw-r--r--
zsyscall_freebsd_arm.go	33.58 KB	-rw-r--r--
zsyscall_freebsd_arm64.go	33.41 KB	-rw-r--r--
zsyscall_linux_386.go	35.54 KB	-rw-r--r--
zsyscall_linux_amd64.go	40.66 KB	-rw-r--r--
zsyscall_linux_arm.go	39.77 KB	-rw-r--r--
zsyscall_linux_arm64.go	38.92 KB	-rw-r--r--
zsyscall_linux_mips.go	41.52 KB	-rw-r--r--
zsyscall_linux_mips64.go	41.3 KB	-rw-r--r--
zsyscall_linux_mips64le.go	41.3 KB	-rw-r--r--
zsyscall_linux_mipsle.go	41.52 KB	-rw-r--r--
zsyscall_linux_ppc64.go	41.94 KB	-rw-r--r--
zsyscall_linux_ppc64le.go	41.94 KB	-rw-r--r--
zsyscall_linux_riscv64.go	38.95 KB	-rw-r--r--
zsyscall_linux_s390x.go	35.94 KB	-rw-r--r--
zsyscall_netbsd_386.go	29.62 KB	-rw-r--r--
zsyscall_netbsd_amd64.go	29.48 KB	-rw-r--r--
zsyscall_netbsd_arm.go	29.63 KB	-rw-r--r--
zsyscall_netbsd_arm64.go	29.48 KB	-rw-r--r--
zsyscall_openbsd_386.go	30.46 KB	-rw-r--r--
zsyscall_openbsd_amd64.go	30.32 KB	-rw-r--r--
zsyscall_openbsd_arm.go	30.47 KB	-rw-r--r--
zsyscall_openbsd_arm64.go	30.32 KB	-rw-r--r--
zsyscall_plan9_386.go	6.17 KB	-rw-r--r--
zsyscall_plan9_amd64.go	6.17 KB	-rw-r--r--
zsyscall_plan9_arm.go	6.17 KB	-rw-r--r--
zsyscall_solaris_amd64.go	35.79 KB	-rw-r--r--
zsyscall_windows.go	60.53 KB	-rw-r--r--
zsysctl_openbsd.go	11.71 KB	-rw-r--r--
zsysnum_darwin_386.go	14.55 KB	-rw-r--r--
zsysnum_darwin_amd64.go	14.55 KB	-rw-r--r--
zsysnum_darwin_arm.go	12.28 KB	-rw-r--r--
zsysnum_darwin_arm64.go	14.38 KB	-rw-r--r--
zsysnum_dragonfly_amd64.go	22.72 KB	-rw-r--r--
zsysnum_freebsd_386.go	25.65 KB	-rw-r--r--
zsysnum_freebsd_amd64.go	25.65 KB	-rw-r--r--
zsysnum_freebsd_arm.go	25.65 KB	-rw-r--r--
zsysnum_freebsd_arm64.go	36.09 KB	-rw-r--r--
zsysnum_linux_386.go	11.26 KB	-rw-r--r--
zsysnum_linux_amd64.go	10.1 KB	-rw-r--r--
zsysnum_linux_arm.go	11.55 KB	-rw-r--r--
zsysnum_linux_arm64.go	8.95 KB	-rw-r--r--
zsysnum_linux_mips.go	12.1 KB	-rw-r--r--
zsysnum_linux_mips64.go	10.93 KB	-rw-r--r--
zsysnum_linux_mips64le.go	10.93 KB	-rw-r--r--
zsysnum_linux_mipsle.go	12.1 KB	-rw-r--r--
zsysnum_linux_ppc64.go	11.46 KB	-rw-r--r--
zsysnum_linux_ppc64le.go	11.49 KB	-rw-r--r--
zsysnum_linux_riscv64.go	8.88 KB	-rw-r--r--
zsysnum_linux_s390x.go	10.64 KB	-rw-r--r--
zsysnum_netbsd_386.go	25.54 KB	-rw-r--r--
zsysnum_netbsd_amd64.go	25.55 KB	-rw-r--r--
zsysnum_netbsd_arm.go	25.54 KB	-rw-r--r--
zsysnum_netbsd_arm64.go	25.55 KB	-rw-r--r--
zsysnum_openbsd_386.go	14.15 KB	-rw-r--r--
zsysnum_openbsd_amd64.go	14.15 KB	-rw-r--r--
zsysnum_openbsd_arm.go	14.46 KB	-rw-r--r--
zsysnum_openbsd_arm64.go	14.72 KB	-rw-r--r--
zsysnum_plan9.go	1.03 KB	-rw-r--r--
zsysnum_solaris_amd64.go	289 B	-rw-r--r--
zsysnum_windows_386.go	40 B	-rw-r--r--
zsysnum_windows_amd64.go	40 B	-rw-r--r--
ztypes_aix_ppc64.go	4.17 KB	-rw-r--r--
ztypes_darwin_386.go	6.7 KB	-rw-r--r--
ztypes_darwin_amd64.go	6.92 KB	-rw-r--r--
ztypes_darwin_arm.go	6.77 KB	-rw-r--r--
ztypes_darwin_arm64.go	6.92 KB	-rw-r--r--
ztypes_dragonfly_amd64.go	6.7 KB	-rw-r--r--
ztypes_freebsd_386.go	9 KB	-rw-r--r--
ztypes_freebsd_amd64.go	9 KB	-rw-r--r--
ztypes_freebsd_arm.go	9.01 KB	-rw-r--r--
ztypes_freebsd_arm64.go	9 KB	-rw-r--r--
ztypes_linux_386.go	11.55 KB	-rw-r--r--
ztypes_linux_amd64.go	11.92 KB	-rw-r--r--
ztypes_linux_arm.go	11.44 KB	-rw-r--r--
ztypes_linux_arm64.go	10.12 KB	-rw-r--r--
ztypes_linux_mips.go	9.93 KB	-rw-r--r--
ztypes_linux_mips64.go	10.05 KB	-rw-r--r--
ztypes_linux_mips64le.go	10.05 KB	-rw-r--r--
ztypes_linux_mipsle.go	9.93 KB	-rw-r--r--
ztypes_linux_ppc64.go	10.21 KB	-rw-r--r--
ztypes_linux_ppc64le.go	10.35 KB	-rw-r--r--
ztypes_linux_riscv64.go	10.2 KB	-rw-r--r--
ztypes_linux_s390x.go	10.39 KB	-rw-r--r--
ztypes_netbsd_386.go	5.98 KB	-rw-r--r--
ztypes_netbsd_amd64.go	6.17 KB	-rw-r--r--
ztypes_netbsd_arm.go	6.13 KB	-rw-r--r--
ztypes_netbsd_arm64.go	6.17 KB	-rw-r--r--
ztypes_openbsd_386.go	6.73 KB	-rw-r--r--
ztypes_openbsd_amd64.go	6.88 KB	-rw-r--r--
ztypes_openbsd_arm.go	6.84 KB	-rw-r--r--
ztypes_openbsd_arm64.go	6.66 KB	-rw-r--r--
ztypes_solaris_amd64.go	5.56 KB	-rw-r--r--

Code Editor : exec_linux.go

// Copyright 2011 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 linux

package syscall

import (
	"runtime"
	"unsafe"
)

// SysProcIDMap holds Container ID to Host ID mappings used for User Namespaces in Linux.
// See user_namespaces(7).
type SysProcIDMap struct {
	ContainerID int // Container ID.
	HostID      int // Host ID.
	Size        int // Size.
}

type SysProcAttr struct {
	Chroot     string      // Chroot.
	Credential *Credential // Credential.
	// Ptrace tells the child to call ptrace(PTRACE_TRACEME).
	// Call runtime.LockOSThread before starting a process with this set,
	// and don't call UnlockOSThread until done with PtraceSyscall calls.
	Ptrace       bool
	Setsid       bool           // Create session.
	Setpgid      bool           // Set process group ID to Pgid, or, if Pgid == 0, to new pid.
	Setctty      bool           // Set controlling terminal to fd Ctty (only meaningful if Setsid is set)
	Noctty       bool           // Detach fd 0 from controlling terminal
	Ctty         int            // Controlling TTY fd
	Foreground   bool           // Place child's process group in foreground. (Implies Setpgid. Uses Ctty as fd of controlling TTY)
	Pgid         int            // Child's process group ID if Setpgid.
	Pdeathsig    Signal         // Signal that the process will get when its parent dies (Linux only)
	Cloneflags   uintptr        // Flags for clone calls (Linux only)
	Unshareflags uintptr        // Flags for unshare calls (Linux only)
	UidMappings  []SysProcIDMap // User ID mappings for user namespaces.
	GidMappings  []SysProcIDMap // Group ID mappings for user namespaces.
	// GidMappingsEnableSetgroups enabling setgroups syscall.
	// If false, then setgroups syscall will be disabled for the child process.
	// This parameter is no-op if GidMappings == nil. Otherwise for unprivileged
	// users this should be set to false for mappings work.
	GidMappingsEnableSetgroups bool
	AmbientCaps                []uintptr // Ambient capabilities (Linux only)
}

var (
	none  = [...]byte{'n', 'o', 'n', 'e', 0}
	slash = [...]byte{'/', 0}
)

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because
// they might have been locked at the time of the fork. This means
// no rescheduling, no malloc calls, and no new stack segments.
// For the same reason compiler does not race instrument it.
// The calls to RawSyscall are okay because they are assembly
// functions that do not grow the stack.
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
	// Set up and fork. This returns immediately in the parent or
	// if there's an error.
	r1, err1, p, locked := forkAndExecInChild1(argv0, argv, envv, chroot, dir, attr, sys, pipe)
	if locked {
		runtime_AfterFork()
	}
	if err1 != 0 {
		return 0, err1
	}

// parent; return PID
	pid = int(r1)

if sys.UidMappings != nil || sys.GidMappings != nil {
		Close(p[0])
		var err2 Errno
		// uid/gid mappings will be written after fork and unshare(2) for user
		// namespaces.
		if sys.Unshareflags&CLONE_NEWUSER == 0 {
			if err := writeUidGidMappings(pid, sys); err != nil {
				err2 = err.(Errno)
			}
		}
		RawSyscall(SYS_WRITE, uintptr(p[1]), uintptr(unsafe.Pointer(&err2)), unsafe.Sizeof(err2))
		Close(p[1])
	}

return pid, 0
}

const _LINUX_CAPABILITY_VERSION_3 = 0x20080522

type capHeader struct {
	version uint32
	pid     int32
}

type capData struct {
	effective   uint32
	permitted   uint32
	inheritable uint32
}
type caps struct {
	hdr  capHeader
	data [2]capData
}

// See CAP_TO_INDEX in linux/capability.h:
func capToIndex(cap uintptr) uintptr { return cap >> 5 }

// See CAP_TO_MASK in linux/capability.h:
func capToMask(cap uintptr) uint32 { return 1 << uint(cap&31) }

// forkAndExecInChild1 implements the body of forkAndExecInChild up to
// the parent's post-fork path. This is a separate function so we can
// separate the child's and parent's stack frames if we're using
// vfork.
//
// This is go:noinline because the point is to keep the stack frames
// of this and forkAndExecInChild separate.
//
//go:noinline
//go:norace
func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (r1 uintptr, err1 Errno, p [2]int, locked bool) {
	// Defined in linux/prctl.h starting with Linux 4.3.
	const (
		PR_CAP_AMBIENT       = 0x2f
		PR_CAP_AMBIENT_RAISE = 0x2
	)

// vfork requires that the child not touch any of the parent's
	// active stack frames. Hence, the child does all post-fork
	// processing in this stack frame and never returns, while the
	// parent returns immediately from this frame and does all
	// post-fork processing in the outer frame.
	// Declare all variables at top in case any
	// declarations require heap allocation (e.g., err1).
	var (
		err2                      Errno
		nextfd                    int
		i                         int
		caps                      caps
		fd1                       uintptr
		puid, psetgroups, pgid    []byte
		uidmap, setgroups, gidmap []byte
	)

if sys.UidMappings != nil {
		puid = []byte("/proc/self/uid_map\000")
		uidmap = formatIDMappings(sys.UidMappings)
	}

if sys.GidMappings != nil {
		psetgroups = []byte("/proc/self/setgroups\000")
		pgid = []byte("/proc/self/gid_map\000")

if sys.GidMappingsEnableSetgroups {
			setgroups = []byte("allow\000")
		} else {
			setgroups = []byte("deny\000")
		}
		gidmap = formatIDMappings(sys.GidMappings)
	}

// Record parent PID so child can test if it has died.
	ppid, _ := rawSyscallNoError(SYS_GETPID, 0, 0, 0)

// Guard against side effects of shuffling fds below.
	// Make sure that nextfd is beyond any currently open files so
	// that we can't run the risk of overwriting any of them.
	fd := make([]int, len(attr.Files))
	nextfd = len(attr.Files)
	for i, ufd := range attr.Files {
		if nextfd < int(ufd) {
			nextfd = int(ufd)
		}
		fd[i] = int(ufd)
	}
	nextfd++

// Allocate another pipe for parent to child communication for
	// synchronizing writing of User ID/Group ID mappings.
	if sys.UidMappings != nil || sys.GidMappings != nil {
		if err := forkExecPipe(p[:]); err != nil {
			err1 = err.(Errno)
			return
		}
	}

hasRawVforkSyscall := runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64"

// About to call fork.
	// No more allocation or calls of non-assembly functions.
	runtime_BeforeFork()
	locked = true
	switch {
	case hasRawVforkSyscall && (sys.Cloneflags&CLONE_NEWUSER == 0 && sys.Unshareflags&CLONE_NEWUSER == 0):
		r1, err1 = rawVforkSyscall(SYS_CLONE, uintptr(SIGCHLD|CLONE_VFORK|CLONE_VM)|sys.Cloneflags)
	case runtime.GOARCH == "s390x":
		r1, _, err1 = RawSyscall6(SYS_CLONE, 0, uintptr(SIGCHLD)|sys.Cloneflags, 0, 0, 0, 0)
	default:
		r1, _, err1 = RawSyscall6(SYS_CLONE, uintptr(SIGCHLD)|sys.Cloneflags, 0, 0, 0, 0, 0)
	}
	if err1 != 0 || r1 != 0 {
		// If we're in the parent, we must return immediately
		// so we're not in the same stack frame as the child.
		// This can at most use the return PC, which the child
		// will not modify, and the results of
		// rawVforkSyscall, which must have been written after
		// the child was replaced.
		return
	}

// Fork succeeded, now in child.

runtime_AfterForkInChild()

// Enable the "keep capabilities" flag to set ambient capabilities later.
	if len(sys.AmbientCaps) > 0 {
		_, _, err1 = RawSyscall6(SYS_PRCTL, PR_SET_KEEPCAPS, 1, 0, 0, 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Wait for User ID/Group ID mappings to be written.
	if sys.UidMappings != nil || sys.GidMappings != nil {
		if _, _, err1 = RawSyscall(SYS_CLOSE, uintptr(p[1]), 0, 0); err1 != 0 {
			goto childerror
		}
		r1, _, err1 = RawSyscall(SYS_READ, uintptr(p[0]), uintptr(unsafe.Pointer(&err2)), unsafe.Sizeof(err2))
		if err1 != 0 {
			goto childerror
		}
		if r1 != unsafe.Sizeof(err2) {
			err1 = EINVAL
			goto childerror
		}
		if err2 != 0 {
			err1 = err2
			goto childerror
		}
	}

// Session ID
	if sys.Setsid {
		_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Set process group
	if sys.Setpgid || sys.Foreground {
		// Place child in process group.
		_, _, err1 = RawSyscall(SYS_SETPGID, 0, uintptr(sys.Pgid), 0)
		if err1 != 0 {
			goto childerror
		}
	}

if sys.Foreground {
		pgrp := int32(sys.Pgid)
		if pgrp == 0 {
			r1, _ = rawSyscallNoError(SYS_GETPID, 0, 0, 0)

pgrp = int32(r1)
		}

// Place process group in foreground.
		_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
		if err1 != 0 {
			goto childerror
		}
	}

// Unshare
	if sys.Unshareflags != 0 {
		_, _, err1 = RawSyscall(SYS_UNSHARE, sys.Unshareflags, 0, 0)
		if err1 != 0 {
			goto childerror
		}

if sys.Unshareflags&CLONE_NEWUSER != 0 && sys.GidMappings != nil {
			dirfd := int(_AT_FDCWD)
			if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&psetgroups[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
				goto childerror
			}
			r1, _, err1 = RawSyscall(SYS_WRITE, uintptr(fd1), uintptr(unsafe.Pointer(&setgroups[0])), uintptr(len(setgroups)))
			if err1 != 0 {
				goto childerror
			}
			if _, _, err1 = RawSyscall(SYS_CLOSE, uintptr(fd1), 0, 0); err1 != 0 {
				goto childerror
			}

if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&pgid[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
				goto childerror
			}
			r1, _, err1 = RawSyscall(SYS_WRITE, uintptr(fd1), uintptr(unsafe.Pointer(&gidmap[0])), uintptr(len(gidmap)))
			if err1 != 0 {
				goto childerror
			}
			if _, _, err1 = RawSyscall(SYS_CLOSE, uintptr(fd1), 0, 0); err1 != 0 {
				goto childerror
			}
		}

if sys.Unshareflags&CLONE_NEWUSER != 0 && sys.UidMappings != nil {
			dirfd := int(_AT_FDCWD)
			if fd1, _, err1 = RawSyscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(&puid[0])), uintptr(O_WRONLY), 0, 0, 0); err1 != 0 {
				goto childerror
			}
			r1, _, err1 = RawSyscall(SYS_WRITE, uintptr(fd1), uintptr(unsafe.Pointer(&uidmap[0])), uintptr(len(uidmap)))
			if err1 != 0 {
				goto childerror
			}
			if _, _, err1 = RawSyscall(SYS_CLOSE, uintptr(fd1), 0, 0); err1 != 0 {
				goto childerror
			}
		}

// The unshare system call in Linux doesn't unshare mount points
		// mounted with --shared. Systemd mounts / with --shared. For a
		// long discussion of the pros and cons of this see debian bug 739593.
		// The Go model of unsharing is more like Plan 9, where you ask
		// to unshare and the namespaces are unconditionally unshared.
		// To make this model work we must further mark / as MS_PRIVATE.
		// This is what the standard unshare command does.
		if sys.Unshareflags&CLONE_NEWNS == CLONE_NEWNS {
			_, _, err1 = RawSyscall6(SYS_MOUNT, uintptr(unsafe.Pointer(&none[0])), uintptr(unsafe.Pointer(&slash[0])), 0, MS_REC|MS_PRIVATE, 0, 0)
			if err1 != 0 {
				goto childerror
			}
		}
	}

// Chroot
	if chroot != nil {
		_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// User and groups
	if cred := sys.Credential; cred != nil {
		ngroups := uintptr(len(cred.Groups))
		groups := uintptr(0)
		if ngroups > 0 {
			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
		}
		if !(sys.GidMappings != nil && !sys.GidMappingsEnableSetgroups && ngroups == 0) && !cred.NoSetGroups {
			_, _, err1 = RawSyscall(_SYS_setgroups, ngroups, groups, 0)
			if err1 != 0 {
				goto childerror
			}
		}
		_, _, err1 = RawSyscall(sys_SETGID, uintptr(cred.Gid), 0, 0)
		if err1 != 0 {
			goto childerror
		}
		_, _, err1 = RawSyscall(sys_SETUID, uintptr(cred.Uid), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

if len(sys.AmbientCaps) != 0 {
		// Ambient capabilities were added in the 4.3 kernel,
		// so it is safe to always use _LINUX_CAPABILITY_VERSION_3.
		caps.hdr.version = _LINUX_CAPABILITY_VERSION_3

if _, _, err1 := RawSyscall(SYS_CAPGET, uintptr(unsafe.Pointer(&caps.hdr)), uintptr(unsafe.Pointer(&caps.data[0])), 0); err1 != 0 {
			goto childerror
		}

for _, c := range sys.AmbientCaps {
			// Add the c capability to the permitted and inheritable capability mask,
			// otherwise we will not be able to add it to the ambient capability mask.
			caps.data[capToIndex(c)].permitted |= capToMask(c)
			caps.data[capToIndex(c)].inheritable |= capToMask(c)
		}

if _, _, err1 := RawSyscall(SYS_CAPSET, uintptr(unsafe.Pointer(&caps.hdr)), uintptr(unsafe.Pointer(&caps.data[0])), 0); err1 != 0 {
			goto childerror
		}

for _, c := range sys.AmbientCaps {
			_, _, err1 = RawSyscall6(SYS_PRCTL, PR_CAP_AMBIENT, uintptr(PR_CAP_AMBIENT_RAISE), c, 0, 0, 0)
			if err1 != 0 {
				goto childerror
			}
		}
	}

// Chdir
	if dir != nil {
		_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Parent death signal
	if sys.Pdeathsig != 0 {
		_, _, err1 = RawSyscall6(SYS_PRCTL, PR_SET_PDEATHSIG, uintptr(sys.Pdeathsig), 0, 0, 0, 0)
		if err1 != 0 {
			goto childerror
		}

// Signal self if parent is already dead. This might cause a
		// duplicate signal in rare cases, but it won't matter when
		// using SIGKILL.
		r1, _ = rawSyscallNoError(SYS_GETPPID, 0, 0, 0)
		if r1 != ppid {
			pid, _ := rawSyscallNoError(SYS_GETPID, 0, 0, 0)
			_, _, err1 := RawSyscall(SYS_KILL, pid, uintptr(sys.Pdeathsig), 0)
			if err1 != 0 {
				goto childerror
			}
		}
	}

// Pass 1: look for fd[i] < i and move those up above len(fd)
	// so that pass 2 won't stomp on an fd it needs later.
	if pipe < nextfd {
		_, _, err1 = RawSyscall(_SYS_dup, uintptr(pipe), uintptr(nextfd), 0)
		if err1 != 0 {
			goto childerror
		}
		RawSyscall(fcntl64Syscall, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
		pipe = nextfd
		nextfd++
	}
	for i = 0; i < len(fd); i++ {
		if fd[i] >= 0 && fd[i] < int(i) {
			if nextfd == pipe { // don't stomp on pipe
				nextfd++
			}
			_, _, err1 = RawSyscall(_SYS_dup, uintptr(fd[i]), uintptr(nextfd), 0)
			if err1 != 0 {
				goto childerror
			}
			RawSyscall(fcntl64Syscall, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
			fd[i] = nextfd
			nextfd++
		}
	}

// Pass 2: dup fd[i] down onto i.
	for i = 0; i < len(fd); i++ {
		if fd[i] == -1 {
			RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
			continue
		}
		if fd[i] == int(i) {
			// dup2(i, i) won't clear close-on-exec flag on Linux,
			// probably not elsewhere either.
			_, _, err1 = RawSyscall(fcntl64Syscall, uintptr(fd[i]), F_SETFD, 0)
			if err1 != 0 {
				goto childerror
			}
			continue
		}
		// The new fd is created NOT close-on-exec,
		// which is exactly what we want.
		_, _, err1 = RawSyscall(_SYS_dup, uintptr(fd[i]), uintptr(i), 0)
		if err1 != 0 {
			goto childerror
		}
	}

// By convention, we don't close-on-exec the fds we are
	// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
	// Programs that know they inherit fds >= 3 will need
	// to set them close-on-exec.
	for i = len(fd); i < 3; i++ {
		RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
	}

// Detach fd 0 from tty
	if sys.Noctty {
		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Set the controlling TTY to Ctty
	if sys.Setctty {
		_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 1)
		if err1 != 0 {
			goto childerror
		}
	}

// Enable tracing if requested.
	// Do this right before exec so that we don't unnecessarily trace the runtime
	// setting up after the fork. See issue #21428.
	if sys.Ptrace {
		_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Time to exec.
	_, _, err1 = RawSyscall(SYS_EXECVE,
		uintptr(unsafe.Pointer(argv0)),
		uintptr(unsafe.Pointer(&argv[0])),
		uintptr(unsafe.Pointer(&envv[0])))

childerror:
	// send error code on pipe
	RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
	for {
		RawSyscall(SYS_EXIT, 253, 0, 0)
	}
}

// Try to open a pipe with O_CLOEXEC set on both file descriptors.
func forkExecPipe(p []int) (err error) {
	err = Pipe2(p, O_CLOEXEC)
	// pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
	// might not be implemented.
	if err == ENOSYS {
		if err = Pipe(p); err != nil {
			return
		}
		if _, err = fcntl(p[0], F_SETFD, FD_CLOEXEC); err != nil {
			return
		}
		_, err = fcntl(p[1], F_SETFD, FD_CLOEXEC)
	}
	return
}

func formatIDMappings(idMap []SysProcIDMap) []byte {
	var data []byte
	for _, im := range idMap {
		data = append(data, []byte(itoa(im.ContainerID)+" "+itoa(im.HostID)+" "+itoa(im.Size)+"\n")...)
	}
	return data
}

// writeIDMappings writes the user namespace User ID or Group ID mappings to the specified path.
func writeIDMappings(path string, idMap []SysProcIDMap) error {
	fd, err := Open(path, O_RDWR, 0)
	if err != nil {
		return err
	}

if _, err := Write(fd, formatIDMappings(idMap)); err != nil {
		Close(fd)
		return err
	}

if err := Close(fd); err != nil {
		return err
	}

return nil
}

// writeSetgroups writes to /proc/PID/setgroups "deny" if enable is false
// and "allow" if enable is true.
// This is needed since kernel 3.19, because you can't write gid_map without
// disabling setgroups() system call.
func writeSetgroups(pid int, enable bool) error {
	sgf := "/proc/" + itoa(pid) + "/setgroups"
	fd, err := Open(sgf, O_RDWR, 0)
	if err != nil {
		return err
	}

var data []byte
	if enable {
		data = []byte("allow")
	} else {
		data = []byte("deny")
	}

if _, err := Write(fd, data); err != nil {
		Close(fd)
		return err
	}

return Close(fd)
}

// writeUidGidMappings writes User ID and Group ID mappings for user namespaces
// for a process and it is called from the parent process.
func writeUidGidMappings(pid int, sys *SysProcAttr) error {
	if sys.UidMappings != nil {
		uidf := "/proc/" + itoa(pid) + "/uid_map"
		if err := writeIDMappings(uidf, sys.UidMappings); err != nil {
			return err
		}
	}

if sys.GidMappings != nil {
		// If the kernel is too old to support /proc/PID/setgroups, writeSetGroups will return ENOENT; this is OK.
		if err := writeSetgroups(pid, sys.GidMappingsEnableSetgroups); err != nil && err != ENOENT {
			return err
		}
		gidf := "/proc/" + itoa(pid) + "/gid_map"
		if err := writeIDMappings(gidf, sys.GidMappings); err != nil {
			return err
		}
	}

return nil
}

${this.title}

Code Editor : exec_linux.go