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Source file src/syscall/syscall_linux_arm.go

Documentation: syscall

     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.
     4  
     5  package syscall
     6  
     7  import "unsafe"
     8  
     9  const (
    10  	_SYS_dup       = SYS_DUP2
    11  	_SYS_setgroups = SYS_SETGROUPS32
    12  )
    13  
    14  func setTimespec(sec, nsec int64) Timespec {
    15  	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
    16  }
    17  
    18  func setTimeval(sec, usec int64) Timeval {
    19  	return Timeval{Sec: int32(sec), Usec: int32(usec)}
    20  }
    21  
    22  func Pipe(p []int) (err error) {
    23  	if len(p) != 2 {
    24  		return EINVAL
    25  	}
    26  	var pp [2]_C_int
    27  	err = pipe2(&pp, 0)
    28  	p[0] = int(pp[0])
    29  	p[1] = int(pp[1])
    30  	return
    31  }
    32  
    33  //sysnb pipe2(p *[2]_C_int, flags int) (err error)
    34  
    35  func Pipe2(p []int, flags int) (err error) {
    36  	if len(p) != 2 {
    37  		return EINVAL
    38  	}
    39  	var pp [2]_C_int
    40  	err = pipe2(&pp, flags)
    41  	p[0] = int(pp[0])
    42  	p[1] = int(pp[1])
    43  	return
    44  }
    45  
    46  // Underlying system call writes to newoffset via pointer.
    47  // Implemented in assembly to avoid allocation.
    48  func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)
    49  
    50  func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
    51  	newoffset, errno := seek(fd, offset, whence)
    52  	if errno != 0 {
    53  		return 0, errno
    54  	}
    55  	return newoffset, nil
    56  }
    57  
    58  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, 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) = SYS_GETGROUPS32
    63  //sysnb	setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
    64  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
    65  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
    66  //sysnb	socket(domain int, typ int, proto int) (fd int, 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  //sysnb	socketpair(domain int, typ int, flags int, fd *[2]int32) (err error)
    72  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
    73  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
    74  
    75  // 64-bit file system and 32-bit uid calls
    76  // (16-bit uid calls are not always supported in newer kernels)
    77  //sys	Dup2(oldfd int, newfd int) (err error)
    78  //sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
    79  //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
    80  //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
    81  //sysnb	Getegid() (egid int) = SYS_GETEGID32
    82  //sysnb	Geteuid() (euid int) = SYS_GETEUID32
    83  //sysnb	Getgid() (gid int) = SYS_GETGID32
    84  //sysnb	Getuid() (uid int) = SYS_GETUID32
    85  //sysnb	InotifyInit() (fd int, err error)
    86  //sys	Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
    87  //sys	Listen(s int, n int) (err error)
    88  //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
    89  //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
    90  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
    91  //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
    92  //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
    93  //sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
    94  //sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
    95  //sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
    96  //sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
    97  //sys	Shutdown(fd int, how int) (err error)
    98  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
    99  //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
   100  
   101  // Vsyscalls on amd64.
   102  //sysnb	Gettimeofday(tv *Timeval) (err error)
   103  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   104  
   105  //sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
   106  //sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
   107  //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
   108  //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
   109  
   110  //sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
   111  //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
   112  
   113  func Fstatfs(fd int, buf *Statfs_t) (err error) {
   114  	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   115  	if e != 0 {
   116  		err = e
   117  	}
   118  	return
   119  }
   120  
   121  func Statfs(path string, buf *Statfs_t) (err error) {
   122  	pathp, err := BytePtrFromString(path)
   123  	if err != nil {
   124  		return err
   125  	}
   126  	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   127  	if e != 0 {
   128  		err = e
   129  	}
   130  	return
   131  }
   132  
   133  func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
   134  	page := uintptr(offset / 4096)
   135  	if offset != int64(page)*4096 {
   136  		return 0, EINVAL
   137  	}
   138  	return mmap2(addr, length, prot, flags, fd, page)
   139  }
   140  
   141  type rlimit32 struct {
   142  	Cur uint32
   143  	Max uint32
   144  }
   145  
   146  //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
   147  
   148  const rlimInf32 = ^uint32(0)
   149  const rlimInf64 = ^uint64(0)
   150  
   151  func Getrlimit(resource int, rlim *Rlimit) (err error) {
   152  	err = prlimit(0, resource, nil, rlim)
   153  	if err != ENOSYS {
   154  		return err
   155  	}
   156  
   157  	rl := rlimit32{}
   158  	err = getrlimit(resource, &rl)
   159  	if err != nil {
   160  		return
   161  	}
   162  
   163  	if rl.Cur == rlimInf32 {
   164  		rlim.Cur = rlimInf64
   165  	} else {
   166  		rlim.Cur = uint64(rl.Cur)
   167  	}
   168  
   169  	if rl.Max == rlimInf32 {
   170  		rlim.Max = rlimInf64
   171  	} else {
   172  		rlim.Max = uint64(rl.Max)
   173  	}
   174  	return
   175  }
   176  
   177  //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
   178  
   179  func Setrlimit(resource int, rlim *Rlimit) (err error) {
   180  	err = prlimit(0, resource, rlim, nil)
   181  	if err != ENOSYS {
   182  		return err
   183  	}
   184  
   185  	rl := rlimit32{}
   186  	if rlim.Cur == rlimInf64 {
   187  		rl.Cur = rlimInf32
   188  	} else if rlim.Cur < uint64(rlimInf32) {
   189  		rl.Cur = uint32(rlim.Cur)
   190  	} else {
   191  		return EINVAL
   192  	}
   193  	if rlim.Max == rlimInf64 {
   194  		rl.Max = rlimInf32
   195  	} else if rlim.Max < uint64(rlimInf32) {
   196  		rl.Max = uint32(rlim.Max)
   197  	} else {
   198  		return EINVAL
   199  	}
   200  
   201  	return setrlimit(resource, &rl)
   202  }
   203  
   204  func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }
   205  
   206  func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }
   207  
   208  func (iov *Iovec) SetLen(length int) {
   209  	iov.Len = uint32(length)
   210  }
   211  
   212  func (msghdr *Msghdr) SetControllen(length int) {
   213  	msghdr.Controllen = uint32(length)
   214  }
   215  
   216  func (cmsg *Cmsghdr) SetLen(length int) {
   217  	cmsg.Len = uint32(length)
   218  }
   219  
   220  func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno) {
   221  	panic("not implemented")
   222  }
   223  

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