//go:cgo_import_dynamic dlsym dlsym ""
//go:cgo_import_dynamic dup dup ""
//go:cgo_import_dynamic dup2 dup2 ""
//go:cgo_import_dynamic dyld_shared_cache_iterate_text dyld_shared_cache_iterate_text ""
//go:cgo_import_dynamic execve execve ""
//go:cgo_import_dynamic exit exit ""
//go:cgo_import_dynamic fstat$INODE64 fstat$INODE64 ""
//go:cgo_import_dynamic ftruncate ftruncate ""
//go:cgo_import_dynamic getpid getpid ""

//go:cgo_import_dynamic dlsym dlsym ""
//go:cgo_import_dynamic dup dup ""
//go:cgo_import_dynamic dup2 dup2 ""
//go:cgo_import_dynamic dyld_shared_cache_iterate_text dyld_shared_cache_iterate_text ""
//go:cgo_import_dynamic execve execve ""
//go:cgo_import_dynamic exit exit ""
//go:cgo_import_dynamic fstat fstat ""
//go:cgo_import_dynamic ftruncate ftruncate ""
//go:cgo_import_dynamic getpid getpid ""
//go:cgo_import_dynamic getrlimit getrlimit ""

//go:build openbsd && !mips64

package syscall

import (
	"internal/abi"
)

var dupTrampoline = abi.FuncPCABI0(libc_dup3_trampoline)

func init() {
	execveOpenBSD = execve
}

func syscallInternal(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
	// OpenBSD 7.5+ no longer supports indirect syscalls. A number of Go
	// packages make use of syscall.Syscall with SYS_IOCTL since it is

import _ "unsafe" // for go:linkname

//go:cgo_import_dynamic libc_chdir chdir "libc.so"
//go:cgo_import_dynamic libc_chroot chroot "libc.so"
//go:cgo_import_dynamic libc_close close "libc.so"
//go:cgo_import_dynamic libc_execve execve "libc.so"
//go:cgo_import_dynamic libc_fcntl fcntl "libc.so"
//go:cgo_import_dynamic libc_forkx forkx "libc.so"
//go:cgo_import_dynamic libc_gethostname gethostname "libc.so"
//go:cgo_import_dynamic libc_getpid getpid "libc.so"

// syscall defines this global on our behalf to avoid a build dependency on other platforms
func init() {
	execveLibc = execve
}

// 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

    // Derived from default when running getconf ARG_MAX in OSX
    public static final int MAX_COMMAND_LINE_LENGTH_OSX = 262144;
    // Dervied from MAX_ARG_STRLEN as per http://man7.org/linux/man-pages/man2/execve.2.html
    public static final int MAX_COMMAND_LINE_LENGTH_NIX = 131072;
    private static final String WINDOWS_LONG_COMMAND_EXCEPTION_MESSAGE = "The filename or extension is too long";

TEXT ·chroot1(SB),NOSPLIT,$0
	JMP	runtime·syscall_chroot(SB)

TEXT ·closeFD(SB),NOSPLIT,$0
	JMP	runtime·syscall_close(SB)

TEXT ·dup2child(SB),NOSPLIT,$0
	JMP	runtime·syscall_dup2(SB)
	RET

TEXT ·execve(SB),NOSPLIT,$0
	JMP	runtime·syscall_execve(SB)

TEXT ·exit(SB),NOSPLIT,$0
	JMP	runtime·syscall_exit(SB)

TEXT ·fcntl1(SB),NOSPLIT,$0
	JMP	runtime·syscall_fcntl(SB)

TEXT ·forkx(SB),NOSPLIT,$0

//go:cgo_import_dynamic libc_chdir chdir "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_chroot chroot "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_dup2 dup2 "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_execve execve "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_fcntl fcntl "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_fork fork "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_ioctl ioctl "libc.a/shr_64.o"

	// the file it points to has been changed we will use the updated symlink.
	argv0, err := exec.LookPath(os.Args[0])
	if err != nil {
		return err
	}

	// Invokes the execve system call.
	// Re-uses the same pid. This preserves the pid over multiple server-respawns.
	return syscall.Exec(argv0, os.Args, os.Environ())
}

// freezeServices will freeze all incoming S3 API calls.

// execveLibc is non-nil on OS using libc syscall, set to execve in exec_libc.go; this
// avoids a build dependency for other platforms.
var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno
var execveDarwin func(path *byte, argv **byte, envp **byte) error
var execveOpenBSD func(path *byte, argv **byte, envp **byte) error

// Exec invokes the execve(2) system call.
func Exec(argv0 string, argv []string, envv []string) (err error) {