1// Copyright 2015 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.
4
5package syscall
6
7import "unsafe"
8
9const (
10	_SYS_setgroups  = SYS_SETGROUPS
11	_SYS_clone3     = 435
12	_SYS_faccessat2 = 439
13	_SYS_fchmodat2  = 452
14)
15
16//sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
17//sys	Fchown(fd int, uid int, gid int) (err error)
18//sys	Fstat(fd int, stat *Stat_t) (err error)
19//sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error)
20
21func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
22	return fstatat(fd, path, stat, flags)
23}
24
25//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
26//sys	Ftruncate(fd int, length int64) (err error)
27//sysnb	Getegid() (egid int)
28//sysnb	Geteuid() (euid int)
29//sysnb	Getgid() (gid int)
30//sysnb	getrlimit(resource int, rlim *Rlimit) (err error)
31//sysnb	Getuid() (uid int)
32//sys	Listen(s int, n int) (err error)
33//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
34//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
35//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
36//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
37//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
38//sys	Setfsgid(gid int) (err error)
39//sys	Setfsuid(uid int) (err error)
40//sysnb	setrlimit1(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
41//sys	Shutdown(fd int, how int) (err error)
42//sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
43
44func Stat(path string, stat *Stat_t) (err error) {
45	return fstatat(_AT_FDCWD, path, stat, 0)
46}
47
48func Lchown(path string, uid int, gid int) (err error) {
49	return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
50}
51
52func Lstat(path string, stat *Stat_t) (err error) {
53	return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
54}
55
56//sys	Statfs(path string, buf *Statfs_t) (err error)
57//sys	SyncFileRange(fd int, off int64, n int64, flags int) (err error) = SYS_SYNC_FILE_RANGE2
58//sys	Truncate(path string, length int64) (err error)
59//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
60//sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
61//sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
62//sysnb	getgroups(n int, list *_Gid_t) (nn int, err error)
63//sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
64//sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
65//sysnb	socket(domain int, typ int, proto int) (fd int, err error)
66//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
67//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
68//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
69//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
70//sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
71//sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
72//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
73//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)
74
75type sigset_t struct {
76	X__val [16]uint64
77}
78
79//sys	pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *sigset_t) (n int, err error) = SYS_PSELECT6
80
81func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) {
82	var ts *Timespec
83	if timeout != nil {
84		ts = &Timespec{Sec: timeout.Sec, Nsec: timeout.Usec * 1000}
85	}
86	return pselect(nfd, r, w, e, ts, nil)
87}
88
89//sysnb	Gettimeofday(tv *Timeval) (err error)
90
91func setTimespec(sec, nsec int64) Timespec {
92	return Timespec{Sec: sec, Nsec: nsec}
93}
94
95func setTimeval(sec, usec int64) Timeval {
96	return Timeval{Sec: sec, Usec: usec}
97}
98
99func futimesat(dirfd int, path string, tv *[2]Timeval) (err error) {
100	if tv == nil {
101		return utimensat(dirfd, path, nil, 0)
102	}
103
104	ts := []Timespec{
105		NsecToTimespec(TimevalToNsec(tv[0])),
106		NsecToTimespec(TimevalToNsec(tv[1])),
107	}
108	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
109}
110
111func Time(t *Time_t) (Time_t, error) {
112	var tv Timeval
113	err := Gettimeofday(&tv)
114	if err != nil {
115		return 0, err
116	}
117	if t != nil {
118		*t = Time_t(tv.Sec)
119	}
120	return Time_t(tv.Sec), nil
121}
122
123func Utime(path string, buf *Utimbuf) error {
124	tv := []Timeval{
125		{Sec: buf.Actime},
126		{Sec: buf.Modtime},
127	}
128	return Utimes(path, tv)
129}
130
131func utimes(path string, tv *[2]Timeval) (err error) {
132	if tv == nil {
133		return utimensat(_AT_FDCWD, path, nil, 0)
134	}
135
136	ts := []Timespec{
137		NsecToTimespec(TimevalToNsec(tv[0])),
138		NsecToTimespec(TimevalToNsec(tv[1])),
139	}
140	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
141}
142
143// Getrlimit prefers the prlimit64 system call. See issue 38604.
144func Getrlimit(resource int, rlim *Rlimit) error {
145	err := prlimit(0, resource, nil, rlim)
146	if err != ENOSYS {
147		return err
148	}
149	return getrlimit(resource, rlim)
150}
151
152// setrlimit prefers the prlimit64 system call. See issue 38604.
153func setrlimit(resource int, rlim *Rlimit) error {
154	err := prlimit(0, resource, rlim, nil)
155	if err != ENOSYS {
156		return err
157	}
158	return setrlimit1(resource, rlim)
159}
160
161//go:nosplit
162func rawSetrlimit(resource int, rlim *Rlimit) Errno {
163	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
164	if errno != ENOSYS {
165		return errno
166	}
167	_, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
168	return errno
169}
170
171func (r *PtraceRegs) PC() uint64 { return r.Pc }
172
173func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }
174
175func (iov *Iovec) SetLen(length int) {
176	iov.Len = uint64(length)
177}
178
179func (msghdr *Msghdr) SetControllen(length int) {
180	msghdr.Controllen = uint64(length)
181}
182
183func (cmsg *Cmsghdr) SetLen(length int) {
184	cmsg.Len = uint64(length)
185}
186
187func InotifyInit() (fd int, err error) {
188	return InotifyInit1(0)
189}
190
191//sys	ppoll(fds *pollFd, nfds int, timeout *Timespec, sigmask *sigset_t) (n int, err error)
192
193func Pause() error {
194	_, err := ppoll(nil, 0, nil, nil)
195	return err
196}
197