syscall: do not use NULL for zero-length read, write
Avoids problems running Linux binaries under QEMU.
R=r, gri
CC=golang-dev
https://golang.org/cl/4151043
diff --git a/src/pkg/syscall/mksyscall.sh b/src/pkg/syscall/mksyscall.sh
index 79d19d0..0f80980 100755
--- a/src/pkg/syscall/mksyscall.sh
+++ b/src/pkg/syscall/mksyscall.sh
@@ -98,14 +98,11 @@
} elsif($type =~ /^\[\](.*)/) {
# Convert slice into pointer, length.
# Have to be careful not to take address of &a[0] if len == 0:
- # pass nil in that case.
+ # pass dummy pointer in that case.
+ # Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
$text .= "\tvar _p$n unsafe.Pointer\n";
$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
- if($nacl) {
- # NaCl rejects zero length write with nil pointer,
- # so use non-nil pointer.
- $text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero[0])\n\t}";
- }
+ $text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
$text .= "\n";
push @args, "uintptr(_p$n)", "uintptr(len($name))";
$n++;
diff --git a/src/pkg/syscall/syscall.go b/src/pkg/syscall/syscall.go
index 1647d69..9697537 100644
--- a/src/pkg/syscall/syscall.go
+++ b/src/pkg/syscall/syscall.go
@@ -24,3 +24,7 @@
// StringBytePtr returns a pointer to a NUL-terminated array of bytes
// containing the text of s.
func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
+
+// Single-word zero for use when we need a valid pointer to 0 bytes.
+// See mksyscall.sh.
+var _zero uintptr
diff --git a/src/pkg/syscall/zsyscall_darwin_386.go b/src/pkg/syscall/zsyscall_darwin_386.go
index 9718e5d..973f00e 100644
--- a/src/pkg/syscall/zsyscall_darwin_386.go
+++ b/src/pkg/syscall/zsyscall_darwin_386.go
@@ -121,6 +121,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -134,6 +136,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
@@ -155,6 +159,8 @@
var _p0 unsafe.Pointer
if len(mib) > 0 {
_p0 = unsafe.Pointer(&mib[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
errno = int(e1)
@@ -377,6 +383,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_GETDIRENTRIES64, uintptr(fd), uintptr(_p0), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
n = int(r0)
@@ -414,6 +422,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
n = int(r0)
@@ -601,6 +611,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
@@ -614,6 +626,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
@@ -627,6 +641,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -640,6 +656,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -871,6 +889,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
diff --git a/src/pkg/syscall/zsyscall_darwin_amd64.go b/src/pkg/syscall/zsyscall_darwin_amd64.go
index 6dca198..f7a37b6 100644
--- a/src/pkg/syscall/zsyscall_darwin_amd64.go
+++ b/src/pkg/syscall/zsyscall_darwin_amd64.go
@@ -121,6 +121,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -134,6 +136,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
@@ -155,6 +159,8 @@
var _p0 unsafe.Pointer
if len(mib) > 0 {
_p0 = unsafe.Pointer(&mib[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
errno = int(e1)
@@ -377,6 +383,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_GETDIRENTRIES64, uintptr(fd), uintptr(_p0), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
n = int(r0)
@@ -414,6 +422,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETFSSTAT64, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
n = int(r0)
@@ -601,6 +611,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -614,6 +626,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -627,6 +641,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -640,6 +656,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -871,6 +889,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
diff --git a/src/pkg/syscall/zsyscall_freebsd_386.go b/src/pkg/syscall/zsyscall_freebsd_386.go
index 627a9a2..1fab5e2 100644
--- a/src/pkg/syscall/zsyscall_freebsd_386.go
+++ b/src/pkg/syscall/zsyscall_freebsd_386.go
@@ -121,6 +121,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -134,6 +136,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
@@ -155,6 +159,8 @@
var _p0 unsafe.Pointer
if len(mib) > 0 {
_p0 = unsafe.Pointer(&mib[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
errno = int(e1)
@@ -361,6 +367,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_GETDIRENTRIES, uintptr(fd), uintptr(_p0), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
n = int(r0)
@@ -398,6 +406,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETFSSTAT, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
n = int(r0)
@@ -609,6 +619,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
@@ -622,6 +634,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
@@ -635,6 +649,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -648,6 +664,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -871,6 +889,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
diff --git a/src/pkg/syscall/zsyscall_freebsd_amd64.go b/src/pkg/syscall/zsyscall_freebsd_amd64.go
index 8872367..53434b2 100644
--- a/src/pkg/syscall/zsyscall_freebsd_amd64.go
+++ b/src/pkg/syscall/zsyscall_freebsd_amd64.go
@@ -121,6 +121,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -134,6 +136,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
@@ -155,6 +159,8 @@
var _p0 unsafe.Pointer
if len(mib) > 0 {
_p0 = unsafe.Pointer(&mib[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
errno = int(e1)
@@ -361,6 +367,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_GETDIRENTRIES, uintptr(fd), uintptr(_p0), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
n = int(r0)
@@ -398,6 +406,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETFSSTAT, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
n = int(r0)
@@ -609,6 +619,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -622,6 +634,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -635,6 +649,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -648,6 +664,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -871,6 +889,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
diff --git a/src/pkg/syscall/zsyscall_linux_386.go b/src/pkg/syscall/zsyscall_linux_386.go
index aa8c41a3..005cc15 100644
--- a/src/pkg/syscall/zsyscall_linux_386.go
+++ b/src/pkg/syscall/zsyscall_linux_386.go
@@ -53,6 +53,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETCWD, uintptr(_p0), uintptr(len(buf)), 0)
n = int(r0)
@@ -184,6 +186,8 @@
var _p0 unsafe.Pointer
if len(events) > 0 {
_p0 = unsafe.Pointer(&events[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_EPOLL_WAIT, uintptr(epfd), uintptr(_p0), uintptr(len(events)), uintptr(msec), 0, 0)
n = int(r0)
@@ -277,6 +281,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETDENTS64, uintptr(fd), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -391,6 +397,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_SYSLOG, uintptr(typ), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -468,6 +476,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -481,6 +491,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -518,6 +530,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETDOMAINNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -530,6 +544,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETHOSTNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -688,6 +704,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -823,6 +841,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD64, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
@@ -836,6 +856,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE64, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
n = int(r0)
diff --git a/src/pkg/syscall/zsyscall_linux_amd64.go b/src/pkg/syscall/zsyscall_linux_amd64.go
index 2759c5c..d449a3b 100644
--- a/src/pkg/syscall/zsyscall_linux_amd64.go
+++ b/src/pkg/syscall/zsyscall_linux_amd64.go
@@ -53,6 +53,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETCWD, uintptr(_p0), uintptr(len(buf)), 0)
n = int(r0)
@@ -184,6 +186,8 @@
var _p0 unsafe.Pointer
if len(events) > 0 {
_p0 = unsafe.Pointer(&events[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_EPOLL_WAIT, uintptr(epfd), uintptr(_p0), uintptr(len(events)), uintptr(msec), 0, 0)
n = int(r0)
@@ -277,6 +281,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETDENTS64, uintptr(fd), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -391,6 +397,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_SYSLOG, uintptr(typ), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -468,6 +476,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -481,6 +491,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -518,6 +530,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETDOMAINNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -530,6 +544,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETHOSTNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -688,6 +704,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -839,6 +857,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PREAD64, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -852,6 +872,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PWRITE64, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
n = int(r0)
@@ -1071,6 +1093,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -1084,6 +1108,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
diff --git a/src/pkg/syscall/zsyscall_linux_arm.go b/src/pkg/syscall/zsyscall_linux_arm.go
index 7111085..22b736b 100644
--- a/src/pkg/syscall/zsyscall_linux_arm.go
+++ b/src/pkg/syscall/zsyscall_linux_arm.go
@@ -53,6 +53,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETCWD, uintptr(_p0), uintptr(len(buf)), 0)
n = int(r0)
@@ -184,6 +186,8 @@
var _p0 unsafe.Pointer
if len(events) > 0 {
_p0 = unsafe.Pointer(&events[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_EPOLL_WAIT, uintptr(epfd), uintptr(_p0), uintptr(len(events)), uintptr(msec), 0, 0)
n = int(r0)
@@ -277,6 +281,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETDENTS64, uintptr(fd), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -391,6 +397,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_SYSLOG, uintptr(typ), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -468,6 +476,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -481,6 +491,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_READLINK, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(buf)))
n = int(r0)
@@ -518,6 +530,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETDOMAINNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -530,6 +544,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall(SYS_SETHOSTNAME, uintptr(_p0), uintptr(len(p)), 0)
errno = int(e1)
@@ -688,6 +704,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
n = int(r0)
@@ -802,6 +820,8 @@
var _p0 unsafe.Pointer
if len(p) > 0 {
_p0 = unsafe.Pointer(&p[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
n = int(r0)
@@ -815,6 +835,8 @@
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
+ } else {
+ _p0 = unsafe.Pointer(&_zero)
}
_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
errno = int(e1)
