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syscall: do not use NULL for zero-length read, write

Browse source 
Avoids problems running Linux binaries under QEMU.

R=r, gri
CC=golang-dev
https://golang.org/cl/4151043
This commit is contained in:
Russ Cox 2011-02-09 14:28:47 -05:00
parent d40ae94993
commit 56faae21d2
9 changed files with 157 additions and 6 deletions
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22
src/pkg/syscall/zsyscall_linux_arm.go
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@ -53,6 +53,8 @@ func Getcwd(buf []byte) (n int, errno int) {
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 @@ func EpollWait(epfd int, events []EpollEvent, msec int) (n int, errno int) {
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 @@ func Getdents(fd int, buf []byte) (n int, errno int) {
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 @@ func Klogctl(typ int, buf []byte) (n int, errno int) {
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 @@ func Read(fd int, p []byte) (n int, errno int) {
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 @@ func Readlink(path string, buf []byte) (n int, errno int) {
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 @@ func Setdomainname(p []byte) (errno int) {
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 @@ func Sethostname(p []byte) (errno int) {
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 @@ func Write(fd int, p []byte) (n int, errno int) {
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 @@ func recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Sockl
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 @@ func sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno i
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)