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Current Path: /opt/golang/1.19.4/src/syscall

📁 ..
📄 asan.go(410 B)
📄 asan0.go(342 B)
📄 asm9_unix2_amd64.s(1.24 KB)
📄 asm_aix_ppc64.s(540 B)
📄 asm_darwin_amd64.s(2.93 KB)
📄 asm_darwin_arm64.s(2.83 KB)
📄 asm_freebsd_arm.s(2.96 KB)
📄 asm_freebsd_arm64.s(2.79 KB)
📄 asm_linux_386.s(3.06 KB)
📄 asm_linux_amd64.s(1.31 KB)
📄 asm_linux_arm.s(1.74 KB)
📄 asm_linux_arm64.s(894 B)
📄 asm_linux_loong64.s(927 B)
📄 asm_linux_mips64x.s(892 B)
📄 asm_linux_mipsx.s(1.61 KB)
📄 asm_linux_ppc64x.s(891 B)
📄 asm_linux_riscv64.s(843 B)
📄 asm_linux_s390x.s(2.13 KB)
📄 asm_netbsd_amd64.s(1.02 KB)
📄 asm_netbsd_arm.s(2.85 KB)
📄 asm_netbsd_arm64.s(2.88 KB)
📄 asm_openbsd_386.s(1.04 KB)
📄 asm_openbsd_amd64.s(1.04 KB)
📄 asm_openbsd_arm.s(1.04 KB)
📄 asm_openbsd_arm64.s(1.04 KB)
📄 asm_openbsd_mips64.s(2.85 KB)
📄 asm_plan9_386.s(3.14 KB)
📄 asm_plan9_amd64.s(3.36 KB)
📄 asm_plan9_arm.s(3.25 KB)
📄 asm_solaris_amd64.s(1.73 KB)
📄 asm_unix_386.s(2.74 KB)
📄 asm_unix_amd64.s(2.15 KB)
📄 bpf_bsd.go(4.62 KB)
📄 bpf_darwin.go(3.97 KB)
📄 const_plan9.go(1.2 KB)
📄 creds_test.go(3.37 KB)
📄 dir_plan9.go(5.62 KB)
📄 dirent.go(2.95 KB)
📄 dirent_test.go(3.44 KB)
📄 dll_windows.go(8.22 KB)
📄 endian_big.go(249 B)
📄 endian_little.go(309 B)
📄 env_unix.go(2.85 KB)
📄 env_windows.go(1.75 KB)
📄 errors_plan9.go(1.61 KB)
📄 exec_aix_test.go(817 B)
📄 exec_bsd.go(7.42 KB)
📄 exec_freebsd.go(7.79 KB)
📄 exec_libc.go(7.74 KB)
📄 exec_libc2.go(7.89 KB)
📄 exec_linux.go(18.39 KB)
📄 exec_linux_test.go(17.49 KB)
📄 exec_pdeathsig_test.go(3 KB)
📄 exec_plan9.go(13.25 KB)
📄 exec_solaris_test.go(809 B)
📄 exec_unix.go(8.75 KB)
📄 exec_unix_test.go(7.03 KB)
📄 exec_windows.go(11.34 KB)
📄 exec_windows_test.go(3.1 KB)
📄 export_darwin_test.go(314 B)
📄 export_freebsd_test.go(304 B)
📄 export_linux_test.go(252 B)
📄 export_unix_test.go(347 B)
📄 export_windows_test.go(439 B)
📄 flock.go(704 B)
📄 flock_aix.go(564 B)
📄 flock_darwin.go(405 B)
📄 flock_linux_32bit.go(511 B)
📄 forkpipe.go(487 B)
📄 forkpipe2.go(307 B)
📄 fs_js.go(10.53 KB)
📄 getdirentries_test.go(2.07 KB)
📁 js
📄 lsf_linux.go(2.12 KB)
📄 mkall.sh(13.19 KB)
📄 mkasm.go(1.75 KB)
📄 mkerrors.sh(10.67 KB)
📄 mkpost.go(1.98 KB)
📄 mksyscall.pl(9.94 KB)
📄 mksyscall_libc.pl(7.96 KB)
📄 mksyscall_windows.go(1.99 KB)
📄 mksysctl_openbsd.pl(5.04 KB)
📄 mksysnum_dragonfly.pl(866 B)
📄 mksysnum_freebsd.pl(1.35 KB)
📄 mksysnum_linux.pl(1.26 KB)
📄 mksysnum_netbsd.pl(1.01 KB)
📄 mksysnum_openbsd.pl(872 B)
📄 mksysnum_plan9.sh(459 B)
📄 mmap_unix_test.go(563 B)
📄 msan.go(410 B)
📄 msan0.go(342 B)
📄 net.go(1.19 KB)
📄 net_js.go(2.11 KB)
📄 netlink_linux.go(4.63 KB)
📄 ptrace_darwin.go(381 B)
📄 ptrace_ios.go(368 B)
📄 pwd_plan9.go(1.55 KB)
📄 route_bsd.go(9.1 KB)
📄 route_darwin.go(2.01 KB)
📄 route_dragonfly.go(2.61 KB)
📄 route_freebsd.go(2.67 KB)
📄 route_freebsd_32bit.go(1.3 KB)
📄 route_freebsd_64bit.go(738 B)
📄 route_netbsd.go(1.43 KB)
📄 route_openbsd.go(1.46 KB)
📄 security_windows.go(10.12 KB)
📄 setuidgid_32_linux.go(435 B)
📄 setuidgid_linux.go(421 B)
📄 sock_cloexec_linux.go(632 B)
📄 sockcmsg_dragonfly.go(547 B)
📄 sockcmsg_linux.go(1.12 KB)
📄 sockcmsg_unix.go(2.51 KB)
📄 sockcmsg_unix_other.go(1.08 KB)
📄 syscall.go(3.62 KB)
📄 syscall_aix.go(17.88 KB)
📄 syscall_aix_ppc64.go(405 B)
📄 syscall_bsd.go(13.55 KB)
📄 syscall_bsd_test.go(1.17 KB)
📄 syscall_darwin.go(11.24 KB)
📄 syscall_darwin_amd64.go(1.92 KB)
📄 syscall_darwin_arm64.go(1.84 KB)
📄 syscall_dragonfly.go(8.57 KB)
📄 syscall_dragonfly_amd64.go(1.12 KB)
📄 syscall_freebsd.go(16.02 KB)
📄 syscall_freebsd_386.go(1.17 KB)
📄 syscall_freebsd_amd64.go(1.12 KB)
📄 syscall_freebsd_arm.go(1.16 KB)
📄 syscall_freebsd_arm64.go(1.12 KB)
📄 syscall_freebsd_test.go(1.55 KB)
📄 syscall_illumos.go(566 B)
📄 syscall_js.go(6.62 KB)
📄 syscall_linux.go(33.47 KB)
📄 syscall_linux_386.go(9.75 KB)
📄 syscall_linux_amd64.go(4.61 KB)
📄 syscall_linux_arm.go(6.46 KB)
📄 syscall_linux_arm64.go(5.94 KB)
📄 syscall_linux_loong64.go(7 KB)
📄 syscall_linux_mips64x.go(5.8 KB)
📄 syscall_linux_mipsx.go(6.26 KB)
📄 syscall_linux_ppc64x.go(4.46 KB)
📄 syscall_linux_riscv64.go(5.63 KB)
📄 syscall_linux_s390x.go(7.75 KB)
📄 syscall_linux_test.go(20.17 KB)
📄 syscall_netbsd.go(7.82 KB)
📄 syscall_netbsd_386.go(716 B)
📄 syscall_netbsd_amd64.go(709 B)
📄 syscall_netbsd_arm.go(716 B)
📄 syscall_netbsd_arm64.go(709 B)
📄 syscall_openbsd.go(6.92 KB)
📄 syscall_openbsd1.go(609 B)
📄 syscall_openbsd_386.go(715 B)
📄 syscall_openbsd_amd64.go(701 B)
📄 syscall_openbsd_arm.go(715 B)
📄 syscall_openbsd_arm64.go(906 B)
📄 syscall_openbsd_libc.go(3.49 KB)
📄 syscall_openbsd_mips64.go(934 B)
📄 syscall_plan9.go(8.97 KB)
📄 syscall_plan9_test.go(1.15 KB)
📄 syscall_ptrace_test.go(768 B)
📄 syscall_solaris.go(15.47 KB)
📄 syscall_solaris_amd64.go(487 B)
📄 syscall_test.go(1.44 KB)
📄 syscall_unix.go(12.05 KB)
📄 syscall_unix_test.go(9.43 KB)
📄 syscall_windows.go(48.92 KB)
📄 syscall_windows_test.go(3.38 KB)
📄 tables_js.go(19.17 KB)
📄 time_fake.go(677 B)
📄 time_nofake.go(351 B)
📄 timestruct.go(944 B)
📄 types_aix.go(3.35 KB)
📄 types_darwin.go(5.03 KB)
📄 types_dragonfly.go(5.05 KB)
📄 types_freebsd.go(6.96 KB)
📄 types_illumos_amd64.go(379 B)
📄 types_linux.go(10.9 KB)
📄 types_netbsd.go(4.77 KB)
📄 types_openbsd.go(5.04 KB)
📄 types_solaris.go(4.88 KB)
📄 types_windows.go(27.71 KB)
📄 types_windows_386.go(477 B)
📄 types_windows_amd64.go(477 B)
📄 types_windows_arm.go(477 B)
📄 types_windows_arm64.go(477 B)
📄 zerrors_aix_ppc64.go(47.16 KB)
📄 zerrors_darwin_amd64.go(55.28 KB)
📄 zerrors_darwin_arm64.go(55.79 KB)
📄 zerrors_dragonfly_amd64.go(59.62 KB)
📄 zerrors_freebsd_386.go(67.35 KB)
📄 zerrors_freebsd_amd64.go(67.4 KB)
📄 zerrors_freebsd_arm.go(67.34 KB)
📄 zerrors_freebsd_arm64.go(67.41 KB)
📄 zerrors_linux_386.go(58.31 KB)
📄 zerrors_linux_amd64.go(58.35 KB)
📄 zerrors_linux_arm.go(58.84 KB)
📄 zerrors_linux_arm64.go(69.52 KB)
📄 zerrors_linux_loong64.go(83.67 KB)
📄 zerrors_linux_mips.go(70.14 KB)
📄 zerrors_linux_mips64.go(69.46 KB)
📄 zerrors_linux_mips64le.go(69.46 KB)
📄 zerrors_linux_mipsle.go(70.14 KB)
📄 zerrors_linux_ppc64.go(71.84 KB)
📄 zerrors_linux_ppc64le.go(72.8 KB)
📄 zerrors_linux_riscv64.go(71.76 KB)
📄 zerrors_linux_s390x.go(74.28 KB)
📄 zerrors_netbsd_386.go(67.48 KB)
📄 zerrors_netbsd_amd64.go(67.07 KB)
📄 zerrors_netbsd_arm.go(66.49 KB)
📄 zerrors_netbsd_arm64.go(67.07 KB)
📄 zerrors_openbsd_386.go(62.52 KB)
📄 zerrors_openbsd_amd64.go(62.48 KB)
📄 zerrors_openbsd_arm.go(62.47 KB)
📄 zerrors_openbsd_arm64.go(66.36 KB)
📄 zerrors_openbsd_mips64.go(66.66 KB)
📄 zerrors_solaris_amd64.go(50.72 KB)
📄 zerrors_windows.go(9.97 KB)
📄 zsyscall_aix_ppc64.go(40.56 KB)
📄 zsyscall_darwin_amd64.go(51.17 KB)
📄 zsyscall_darwin_amd64.s(8.63 KB)
📄 zsyscall_darwin_arm64.go(51.13 KB)
📄 zsyscall_darwin_arm64.s(8.61 KB)
📄 zsyscall_dragonfly_amd64.go(31.19 KB)
📄 zsyscall_freebsd_386.go(33.56 KB)
📄 zsyscall_freebsd_amd64.go(33.42 KB)
📄 zsyscall_freebsd_arm.go(33.58 KB)
📄 zsyscall_freebsd_arm64.go(33.42 KB)
📄 zsyscall_linux_386.go(34.12 KB)
📄 zsyscall_linux_amd64.go(38.93 KB)
📄 zsyscall_linux_arm.go(38.03 KB)
📄 zsyscall_linux_arm64.go(37.4 KB)
📄 zsyscall_linux_loong64.go(36.29 KB)
📄 zsyscall_linux_mips.go(39.78 KB)
📄 zsyscall_linux_mips64.go(39.78 KB)
📄 zsyscall_linux_mips64le.go(39.79 KB)
📄 zsyscall_linux_mipsle.go(39.78 KB)
📄 zsyscall_linux_ppc64.go(40.42 KB)
📄 zsyscall_linux_ppc64le.go(40.43 KB)
📄 zsyscall_linux_riscv64.go(37.43 KB)
📄 zsyscall_linux_s390x.go(34.74 KB)
📄 zsyscall_netbsd_386.go(29.63 KB)
📄 zsyscall_netbsd_amd64.go(29.48 KB)
📄 zsyscall_netbsd_arm.go(29.63 KB)
📄 zsyscall_netbsd_arm64.go(29.48 KB)
📄 zsyscall_openbsd_386.go(47.17 KB)
📄 zsyscall_openbsd_386.s(7.95 KB)
📄 zsyscall_openbsd_amd64.go(47.03 KB)
📄 zsyscall_openbsd_amd64.s(7.95 KB)
📄 zsyscall_openbsd_arm.go(47.19 KB)
📄 zsyscall_openbsd_arm.s(7.95 KB)
📄 zsyscall_openbsd_arm64.go(47.03 KB)
📄 zsyscall_openbsd_arm64.s(7.95 KB)
📄 zsyscall_openbsd_mips64.go(30.33 KB)
📄 zsyscall_plan9_386.go(6.17 KB)
📄 zsyscall_plan9_amd64.go(6.18 KB)
📄 zsyscall_plan9_arm.go(6.17 KB)
📄 zsyscall_solaris_amd64.go(37.08 KB)
📄 zsyscall_windows.go(56.68 KB)
📄 zsysctl_openbsd.go(11.71 KB)
📄 zsysnum_darwin_amd64.go(14.55 KB)
📄 zsysnum_darwin_arm64.go(14.39 KB)
📄 zsysnum_dragonfly_amd64.go(22.94 KB)
📄 zsysnum_freebsd_386.go(25.65 KB)
📄 zsysnum_freebsd_amd64.go(25.65 KB)
📄 zsysnum_freebsd_arm.go(25.65 KB)
📄 zsysnum_freebsd_arm64.go(36.09 KB)
📄 zsysnum_linux_386.go(11.27 KB)
📄 zsysnum_linux_amd64.go(10.11 KB)
📄 zsysnum_linux_arm.go(11.55 KB)
📄 zsysnum_linux_arm64.go(8.95 KB)
📄 zsysnum_linux_loong64.go(10.28 KB)
📄 zsysnum_linux_mips.go(12.1 KB)
📄 zsysnum_linux_mips64.go(10.93 KB)
📄 zsysnum_linux_mips64le.go(10.93 KB)
📄 zsysnum_linux_mipsle.go(12.1 KB)
📄 zsysnum_linux_ppc64.go(11.47 KB)
📄 zsysnum_linux_ppc64le.go(11.49 KB)
📄 zsysnum_linux_riscv64.go(8.88 KB)
📄 zsysnum_linux_s390x.go(10.64 KB)
📄 zsysnum_netbsd_386.go(25.69 KB)
📄 zsysnum_netbsd_amd64.go(25.69 KB)
📄 zsysnum_netbsd_arm.go(25.69 KB)
📄 zsysnum_netbsd_arm64.go(25.69 KB)
📄 zsysnum_openbsd_386.go(14.16 KB)
📄 zsysnum_openbsd_amd64.go(14.16 KB)
📄 zsysnum_openbsd_arm.go(14.46 KB)
📄 zsysnum_openbsd_arm64.go(14.72 KB)
📄 zsysnum_openbsd_mips64.go(14.93 KB)
📄 zsysnum_plan9.go(1.03 KB)
📄 zsysnum_solaris_amd64.go(293 B)
📄 ztypes_aix_ppc64.go(4.17 KB)
📄 ztypes_darwin_amd64.go(6.95 KB)
📄 ztypes_darwin_arm64.go(6.95 KB)
📄 ztypes_dragonfly_amd64.go(6.7 KB)
📄 ztypes_freebsd_386.go(9.01 KB)
📄 ztypes_freebsd_amd64.go(9.01 KB)
📄 ztypes_freebsd_arm.go(9.01 KB)
📄 ztypes_freebsd_arm64.go(9.01 KB)
📄 ztypes_linux_386.go(11.55 KB)
📄 ztypes_linux_amd64.go(11.92 KB)
📄 ztypes_linux_arm.go(11.44 KB)
📄 ztypes_linux_arm64.go(10.13 KB)
📄 ztypes_linux_loong64.go(10.77 KB)
📄 ztypes_linux_mips.go(9.93 KB)
📄 ztypes_linux_mips64.go(10.05 KB)
📄 ztypes_linux_mips64le.go(10.05 KB)
📄 ztypes_linux_mipsle.go(9.93 KB)
📄 ztypes_linux_ppc64.go(10.21 KB)
📄 ztypes_linux_ppc64le.go(10.35 KB)
📄 ztypes_linux_riscv64.go(10.2 KB)
📄 ztypes_linux_s390x.go(10.39 KB)
📄 ztypes_netbsd_386.go(5.99 KB)
📄 ztypes_netbsd_amd64.go(6.17 KB)
📄 ztypes_netbsd_arm.go(6.13 KB)
📄 ztypes_netbsd_arm64.go(6.17 KB)
📄 ztypes_openbsd_386.go(6.73 KB)
📄 ztypes_openbsd_amd64.go(6.89 KB)
📄 ztypes_openbsd_arm.go(6.84 KB)
📄 ztypes_openbsd_arm64.go(6.66 KB)
📄 ztypes_openbsd_mips64.go(6.66 KB)
📄 ztypes_solaris_amd64.go(5.57 KB)

Editing: exec_libc2.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.

//go:build darwin || (openbsd && !mips64)

package syscall

import (
	"internal/abi"
	"runtime"
	"unsafe"
)

type SysProcAttr struct {
	Chroot     string      // Chroot.
	Credential *Credential // Credential.
	Ptrace     bool        // Enable tracing.
	Setsid     bool        // Create session.
	// Setpgid sets the process group ID of the child to Pgid,
	// or, if Pgid == 0, to the new child's process ID.
	Setpgid bool
	// Setctty sets the controlling terminal of the child to
	// file descriptor Ctty. Ctty must be a descriptor number
	// in the child process: an index into ProcAttr.Files.
	// This is only meaningful if Setsid is true.
	Setctty bool
	Noctty  bool // Detach fd 0 from controlling terminal
	Ctty    int  // Controlling TTY fd
	// Foreground places the child process group in the foreground.
	// This implies Setpgid. The Ctty field must be set to
	// the descriptor of the controlling TTY.
	// Unlike Setctty, in this case Ctty must be a descriptor
	// number in the parent process.
	Foreground bool
	Pgid       int // Child's process group ID if Setpgid.
}

// 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) {
	// Declare all variables at top in case any
	// declarations require heap allocation (e.g., err1).
	var (
		r1     uintptr
		err1   Errno
		nextfd int
		i      int
	)

// 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++

// About to call fork.
	// No more allocation or calls of non-assembly functions.
	runtime_BeforeFork()
	r1, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fork_trampoline), 0, 0, 0)
	if err1 != 0 {
		runtime_AfterFork()
		return 0, err1
	}

if r1 != 0 {
		// parent; return PID
		runtime_AfterFork()
		return int(r1), 0
	}

// Fork succeeded, now in child.

// Enable tracing if requested.
	if sys.Ptrace {
		if err := ptrace(PTRACE_TRACEME, 0, 0, 0); err != nil {
			err1 = err.(Errno)
			goto childerror
		}
	}

// Session ID
	if sys.Setsid {
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setsid_trampoline), 0, 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Set process group
	if sys.Setpgid || sys.Foreground {
		// Place child in process group.
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setpgid_trampoline), 0, uintptr(sys.Pgid), 0)
		if err1 != 0 {
			goto childerror
		}
	}

if sys.Foreground {
		// This should really be pid_t, however _C_int (aka int32) is
		// generally equivalent.
		pgrp := _C_int(sys.Pgid)
		if pgrp == 0 {
			r1, _, err1 = rawSyscall(abi.FuncPCABI0(libc_getpid_trampoline), 0, 0, 0)
			if err1 != 0 {
				goto childerror
			}
			pgrp = _C_int(r1)
		}

// Place process group in foreground.
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSPGRP), uintptr(unsafe.Pointer(&pgrp)))
		if err1 != 0 {
			goto childerror
		}
	}

// Restore the signal mask. We do this after TIOCSPGRP to avoid
	// having the kernel send a SIGTTOU signal to the process group.
	runtime_AfterForkInChild()

// Chroot
	if chroot != nil {
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_chroot_trampoline), 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 !cred.NoSetGroups {
			_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgroups_trampoline), ngroups, groups, 0)
			if err1 != 0 {
				goto childerror
			}
		}
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setgid_trampoline), uintptr(cred.Gid), 0, 0)
		if err1 != 0 {
			goto childerror
		}
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_setuid_trampoline), uintptr(cred.Uid), 0, 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Chdir
	if dir != nil {
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_chdir_trampoline), uintptr(unsafe.Pointer(dir)), 0, 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 {
		if runtime.GOOS == "openbsd" {
			_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
		} else {
			_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), 0)
			if err1 != 0 {
				goto childerror
			}
			_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
		}
		if err1 != 0 {
			goto childerror
		}
		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++
			}
			if runtime.GOOS == "openbsd" {
				_, _, err1 = rawSyscall(dupTrampoline, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
			} else {
				_, _, err1 = rawSyscall(dupTrampoline, uintptr(fd[i]), uintptr(nextfd), 0)
				if err1 != 0 {
					goto childerror
				}
				_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(nextfd), F_SETFD, FD_CLOEXEC)
			}
			if err1 != 0 {
				goto childerror
			}
			fd[i] = nextfd
			nextfd++
		}
	}

// Pass 2: dup fd[i] down onto i.
	for i = 0; i < len(fd); i++ {
		if fd[i] == -1 {
			rawSyscall(abi.FuncPCABI0(libc_close_trampoline), 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(abi.FuncPCABI0(libc_fcntl_trampoline), 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(abi.FuncPCABI0(libc_dup2_trampoline), 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(abi.FuncPCABI0(libc_close_trampoline), uintptr(i), 0, 0)
	}

// Detach fd 0 from tty
	if sys.Noctty {
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), 0, uintptr(TIOCNOTTY), 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Set the controlling TTY to Ctty
	if sys.Setctty {
		_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_ioctl_trampoline), uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
		if err1 != 0 {
			goto childerror
		}
	}

// Time to exec.
	_, _, err1 = rawSyscall(abi.FuncPCABI0(libc_execve_trampoline),
		uintptr(unsafe.Pointer(argv0)),
		uintptr(unsafe.Pointer(&argv[0])),
		uintptr(unsafe.Pointer(&envv[0])))

childerror:
	// send error code on pipe
	rawSyscall(abi.FuncPCABI0(libc_write_trampoline), uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
	for {
		rawSyscall(abi.FuncPCABI0(libc_exit_trampoline), 253, 0, 0)
	}
}

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