unix: add Unmount syscall for AIX

Change-Id: I86f33df28b844746617a47b01fb888f4b434564a
Reviewed-on: https://go-review.googlesource.com/c/sys/+/172897
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_aix.go

@@ -444,8 +444,6 @@ func IoctlGetTermios(fd int, req uint) (*Termios, error) {
 //sysnb	Times(tms *Tms) (ticks uintptr, err error)
 //sysnb	Umask(mask int) (oldmask int)
 //sysnb	Uname(buf *Utsname) (err error)
-//TODO umount
-// //sys	Unmount(target string, flags int) (err error) = umount
 //sys   Unlink(path string) (err error)
 //sys   Unlinkat(dirfd int, path string, flags int) (err error)
 //sys	Ustat(dev int, ubuf *Ustat_t) (err error)
@@ -548,3 +546,12 @@ func Poll(fds []PollFd, timeout int) (n int, err error) {
 //sys	Utime(path string, buf *Utimbuf) (err error)
 
 //sys	Getsystemcfg(label int) (n uint64)
+
+//sys	umount(target string) (err error)
+func Unmount(target string, flags int) (err error) {
+	if flags != 0 {
+		// AIX doesn't have any flags for umount.
+		return ENOSYS
+	}
+	return umount(target)
+}

unix/zsyscall_aix_ppc.go

@@ -121,6 +121,7 @@ int gettimeofday(uintptr_t, uintptr_t);
 int time(uintptr_t);
 int utime(uintptr_t, uintptr_t);
 unsigned long long getsystemcfg(int);
+int umount(uintptr_t);
 int getrlimit64(int, uintptr_t);
 int setrlimit64(int, uintptr_t);
 long long lseek64(int, long long, int);
@@ -1431,6 +1432,17 @@ func Getsystemcfg(label int) (n uint64) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func umount(target string) (err error) {
+	_p0 := uintptr(unsafe.Pointer(C.CString(target)))
+	r0, er := C.umount(C.uintptr_t(_p0))
+	if r0 == -1 && er != nil {
+		err = er
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getrlimit(resource int, rlim *Rlimit) (err error) {
 	r0, er := C.getrlimit64(C.int(resource), C.uintptr_t(uintptr(unsafe.Pointer(rlim))))
 	if r0 == -1 && er != nil {

unix/zsyscall_aix_ppc64.go

@@ -1386,6 +1386,21 @@ func Getsystemcfg(label int) (n uint64) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func umount(target string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(target)
+	if err != nil {
+		return
+	}
+	_, e1 := callumount(uintptr(unsafe.Pointer(_p0)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getrlimit(resource int, rlim *Rlimit) (err error) {
 	_, e1 := callgetrlimit(resource, uintptr(unsafe.Pointer(rlim)))
 	if e1 != 0 {

unix/zsyscall_aix_ppc64_gc.go

@@ -122,6 +122,7 @@ import (
 //go:cgo_import_dynamic libc_time time "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_utime utime "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_getsystemcfg getsystemcfg "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_umount umount "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_getrlimit getrlimit "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_setrlimit setrlimit "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_lseek lseek "libc.a/shr_64.o"
@@ -239,6 +240,7 @@ import (
 //go:linkname libc_time libc_time
 //go:linkname libc_utime libc_utime
 //go:linkname libc_getsystemcfg libc_getsystemcfg
+//go:linkname libc_umount libc_umount
 //go:linkname libc_getrlimit libc_getrlimit
 //go:linkname libc_setrlimit libc_setrlimit
 //go:linkname libc_lseek libc_lseek
@@ -359,6 +361,7 @@ var (
 	libc_time,
 	libc_utime,
 	libc_getsystemcfg,
+	libc_umount,
 	libc_getrlimit,
 	libc_setrlimit,
 	libc_lseek,
@@ -1155,6 +1158,13 @@ func callgetsystemcfg(label int) (r1 uintptr, e1 Errno) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func callumount(_p0 uintptr) (r1 uintptr, e1 Errno) {
+	r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_umount)), 1, _p0, 0, 0, 0, 0, 0)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func callgetrlimit(resource int, rlim uintptr) (r1 uintptr, e1 Errno) {
 	r1, _, e1 = rawSyscall6(uintptr(unsafe.Pointer(&libc_getrlimit)), 2, uintptr(resource), rlim, 0, 0, 0, 0)
 	return

unix/zsyscall_aix_ppc64_gccgo.go

@@ -121,6 +121,7 @@ int gettimeofday(uintptr_t, uintptr_t);
 int time(uintptr_t);
 int utime(uintptr_t, uintptr_t);
 unsigned long long getsystemcfg(int);
+int umount(uintptr_t);
 int getrlimit(int, uintptr_t);
 int setrlimit(int, uintptr_t);
 long long lseek(int, long long, int);
@@ -1030,6 +1031,14 @@ func callgetsystemcfg(label int) (r1 uintptr, e1 Errno) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func callumount(_p0 uintptr) (r1 uintptr, e1 Errno) {
+	r1 = uintptr(C.umount(C.uintptr_t(_p0)))
+	e1 = syscall.GetErrno()
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func callgetrlimit(resource int, rlim uintptr) (r1 uintptr, e1 Errno) {
 	r1 = uintptr(C.getrlimit(C.int(resource), C.uintptr_t(rlim)))
 	e1 = syscall.GetErrno()