// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Linux system call wrappers that provide POSIX semantics through the
// corresponding cgo->libc (nptl) wrappers for various system calls.

//go:build linux

package cgo

import "unsafe"

// Each of the following entries is needed to ensure that the
// syscall.syscall_linux code can conditionally call these

//go:cgo_import_dynamic libc_close close "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_read read "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_write write "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_pipe pipe "/usr/lib/libSystem.B.dylib"

//go:cgo_import_dynamic libc_mmap mmap "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_munmap munmap "/usr/lib/libSystem.B.dylib"

	initsig(true)
}

// Ms related functions
func mpreinit(mp *m) {
	mp.gsignal = malg(32 * 1024) // AIX wants >= 8K
	mp.gsignal.m = mp
}

// errno address must be retrieved by calling _Errno libc function.
// This will return a pointer to errno.
func miniterrno() {
	mp := getg().m
	r, _ := syscall0(&libc__Errno)
	mp.perrno = r

}

func minit() {
	miniterrno()
	minitSignals()

	// an atomic_thread_fence_acq() call which behaves as an instruction reordering and
	// memory barrier.
	binuptimeDummy uint32

	zeroBintime bintime
)

// based on /usr/src/lib/libc/sys/__vdso_gettimeofday.c
//
//go:nosplit
func binuptime(abs bool) (bt bintime) {
	timehands := (*[_VDSO_TH_NUM]vdsoTimehands)(add(unsafe.Pointer(timekeepSharedPage), vdsoTimekeepSize))
	for {

	}
	libs, err := f.ImportedLibraries()
	if err != nil {
		t.Fatalf("Failed to read imported libraries: %v", err)
	}

	var count int
	for _, lib := range libs {
		if lib == "libc.so" || strings.HasPrefix(lib, "libc.so.") {
			count++
		}
	}

	if got, want := count, 1; got != want {
		t.Errorf("Got %d entries for `libc.so`, want %d", got, want)
	}
}

	//go:cgo_import_dynamic puts puts#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic __libc_start_main __libc_start_main#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic stdout stdout#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic fflush fflush#GLIBC_2.2.5 "libc.so.6"
	//go:cgo_import_dynamic _ _ "libpthread.so.0"
	//go:cgo_import_dynamic _ _ "libc.so.6"

In the end, the compiled Go package, which will eventually be

 0x0000000000000001 (NEEDED)             Shared library: [libstdc++.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000e (SONAME)             Library soname: [heythere]
 0x000000000000000c (INIT)               0x668
"""],

        }
        if (isLinuxWithMusl()) {
            LOGGER.debug("Native-platform is not available on Linux with musl libc.");
            return false;
        }
        return true;
    }

    /**
     * Our native libraries don't currently support musl libc.
     * See <a href="https://github.com/gradle/gradle/issues/24875">#24875</a>.
     */
    private static boolean isLinuxWithMusl() {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build aix || solaris

// This file handles forkAndExecInChild function for OS using libc syscall like AIX or Solaris.

package syscall

import (
	"runtime"
	"unsafe"
)

type SysProcAttr struct {
	Chroot     string      // Chroot.
	Credential *Credential // Credential.

			// Record unversioned name as seen.
			seenlib[name] = true
			libraries[name] = lib
		} else if _, ok := libraries[lib]; !ok {
			libraries[lib] = lib
		}
	}

	libs = nil
	for _, lib := range libraries {
		libs = append(libs, lib)
	}
	sort.Strings(libs)

	return libs
}

func dedupLibraries(ctxt *Link, libs []string) []string {
	if ctxt.Target.IsOpenbsd() {