1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // GNU/Linux library calls.
11 //sys Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
12 //openat(dirfd int, path *byte, flags int, mode Mode_t) int
14 //sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error)
15 //futimesat(dirfd int, path *byte, times *[2]Timeval) int
16 func Futimesat(dirfd int, path string, tv []Timeval) (err error) {
20 return futimesat(dirfd, StringBytePtr(path), (*[2]Timeval)(unsafe.Pointer(&tv[0])))
23 func Futimes(fd int, tv []Timeval) (err error) {
24 // Believe it or not, this is the best we can do on GNU/Linux
25 // (and is what glibc does).
26 return Utimes("/proc/self/fd/"+itoa(fd), tv)
29 //sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
30 //ptrace(request int, pid Pid_t, addr *byte, data *byte) _C_long
32 //sysnb raw_ptrace(request int, pid int, addr *byte, data *byte) (err Errno)
33 //ptrace(request int, pid Pid_t, addr *byte, data *byte) _C_long
35 func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
36 // The peek requests are machine-size oriented, so we wrap it
37 // to retrieve arbitrary-length data.
39 // The ptrace syscall differs from glibc's ptrace.
40 // Peeks returns the word in *data, not as the return value.
42 var buf [sizeofPtr]byte
44 // Leading edge. PEEKTEXT/PEEKDATA don't require aligned
45 // access (PEEKUSER warns that it might), but if we don't
46 // align our reads, we might straddle an unmapped page
47 // boundary and not get the bytes leading up to the page
50 if addr%sizeofPtr != 0 {
51 err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
55 n += copy(out, buf[addr%sizeofPtr:])
61 // We use an internal buffer to gaurantee alignment.
62 // It's not documented if this is necessary, but we're paranoid.
63 err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
67 copied := copy(out, buf[0:])
75 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
76 return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
79 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
80 return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
83 func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
84 // As for ptracePeek, we need to align our accesses to deal
85 // with the possibility of straddling an invalid page.
89 if addr%sizeofPtr != 0 {
90 var buf [sizeofPtr]byte
91 err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
95 n += copy(buf[addr%sizeofPtr:], data)
96 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
97 err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
105 for len(data) > int(sizeofPtr) {
106 word := *((*uintptr)(unsafe.Pointer(&data[0])))
107 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
112 data = data[sizeofPtr:]
117 var buf [sizeofPtr]byte
118 err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
123 word := *((*uintptr)(unsafe.Pointer(&buf[0])))
124 err = ptrace(pokeReq, pid, addr+uintptr(n), word)
134 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
135 return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
138 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
139 return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
142 func PtraceSetOptions(pid int, options int) (err error) {
143 return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
146 func PtraceGetEventMsg(pid int) (msg uint, err error) {
148 err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
153 func PtraceCont(pid int, signal int) (err error) {
154 return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
157 func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
159 func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
161 func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
163 // FIXME: mksysinfo needs to produce LINUX_REBOOT_MAGIC[12].
165 // //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
166 // //reboot(magic1 uint, magic2 uint, cmd int, arg *byte) int
167 // func Reboot(cmd int) (err error) {
168 // return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
171 //sys Acct(path string) (err error)
172 //acct(path *byte) int
174 // FIXME: mksysinfo Timex
175 // //sys Adjtimex(buf *Timex) (state int, err error)
176 // //adjtimex(buf *Timex) int
178 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
179 //faccessat(dirfd int, pathname *byte, mode int, flags int) int
181 // FIXME: Only in glibc 2.10 and later.
182 // //sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
183 // //fallocate(fd int, mode int, offset Offset_t, len Offset_t) int
185 //sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
186 //fchmodat(dirfd int, pathname *byte, mode Mode_t, flags int) int
188 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
189 //fchownat(dirfd int, path *byte, owner Uid_t, group Gid_t, flags int) int
191 //sys Flock(fd int, how int) (err error)
192 //flock(fd int, how int) int
194 // FIXME: mksysinfo statfs
195 // //sys Fstatfs(fd int, buf *Statfs_t) (err error)
196 // //fstatfs(fd int, buf *Statfs_t) int
198 // FIXME: Only available as a syscall.
199 // //sysnb Gettid() (tid int)
202 // FIXME: mksysinfo linux_dirent
203 // Or just abandon this function.
204 // //sys Getdents(fd int, buf []byte) (n int, err error)
205 // //getdents64(fd int, buf *byte, count uint)
207 //sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
208 //inotify_add_watch(fd int, pathname *byte, mask uint32) int
210 //sysnb InotifyInit() (fd int, err error)
213 // FIXME: Only in glibc 2.9 and later.
214 // //sysnb InotifyInit1(flags int) (fd int, err error)
215 // //inotify_init1(flags int) int
217 //sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
218 //inotify_rm_watch(fd int, wd uint32) int
220 //sys Klogctl(typ int, buf []byte) (n int, err error)
221 //klogctl(typ int, bufp *byte, len int) int
223 //sys Mkdirat(dirfd int, path string, mode uint32) (err error)
224 //mkdirat(dirfd int, path *byte, mode Mode_t) int
226 //sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
227 //mknodat(dirfd int, path *byte, mode Mode_t, dev _dev_t) int
229 //sys PivotRoot(newroot string, putold string) (err error)
230 //pivot_root(newroot *byte, putold *byte) int
232 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
233 //renameat(olddirfd int, oldpath *byte, newdirfd int, newpath *byte) int
235 //sys sendfile(outfd int, infd int, offset *Offset_t, count int) (written int, err error)
236 //sendfile64(outfd int, infd int, offset *Offset_t, count Size_t) Ssize_t
237 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
243 written, err = sendfile(outfd, infd, psoff, count)
245 *offset = int64(soff)
250 //sys Setfsgid(gid int) (err error)
251 //setfsgid(gid Gid_t) int
253 //sys Setfsuid(uid int) (err error)
254 //setfsuid(uid Uid_t) int
256 //sysnb Setresgid(rgid int, egid int, sgid int) (err error)
257 //setresgid(rgid Gid_t, egid Gid_t, sgid Gid_t) int
259 //sysnb Setresuid(ruid int, eguid int, suid int) (err error)
260 //setresuid(ruid Uid_t, euid Uid_t, suid Uid_t) int
262 //sys splice(rfd int, roff *_loff_t, wfd int, woff *_loff_t, len int, flags int) (n int64, err error)
263 //splice(rfd int, roff *_loff_t, wfd int, woff *_loff_t, len Size_t, flags uint) Ssize_t
264 func Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) {
275 n, err = splice(rfd, plroff, wfd, plwoff, len, flags)
285 // FIXME: mksysinfo statfs
286 // //sys Statfs(path string, buf *Statfs_t) (err error)
287 // //statfs(path *byte, buf *Statfs_t) int
289 // FIXME: Only in glibc 2.6 and later.
290 // //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error)
291 // //sync_file_range(fd int, off Offset_t, n Offset_t, flags uint) int
293 // FIXME: mksysinfo Sysinfo_t
294 // //sysnb Sysinfo(info *Sysinfo_t) (err error)
295 // //sysinfo(info *Sysinfo_t) int
297 //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
298 //tee(rfd int, wfd int, len Size_t, flags uint) Ssize_t
300 // FIXME: Only available as a syscall.
301 // //sysnb Tgkill(tgid int, tid int, sig int) (err error)
302 // //tgkill(tgid int, tid int, sig int) int
304 //sys unlinkat(dirfd int, path string, flags int) (err error)
305 //unlinkat(dirfd int, path *byte, flags int) int
307 func Unlinkat(dirfd int, path string) (err error) {
308 return unlinkat(dirfd, path, 0)
311 //sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
312 //umount2(target *byte, flags int) int
314 //sys Unshare(flags int) (err error)
315 //unshare(flags int) int
317 // FIXME: mksysinfo Ustat_t
318 // //sys Ustat(dev int, ubuf *Ustat_t) (err error)
319 // //ustat(dev _dev_t, ubuf *Ustat_t) int