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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  // archHonorsR2 captures the fact that r2 is honored by the
    10  // runtime.GOARCH.  Syscall conventions are generally r1, r2, err :=
    11  // syscall(trap, ...).  Not all architectures define r2 in their
    12  // ABI. See "man syscall". [EABI assumed.]
    13  const archHonorsR2 = true
    14  
    15  const _SYS_setgroups = SYS_SETGROUPS32
    16  
    17  func setTimespec(sec, nsec int64) Timespec {
    18  	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
    19  }
    20  
    21  func setTimeval(sec, usec int64) Timeval {
    22  	return Timeval{Sec: int32(sec), Usec: int32(usec)}
    23  }
    24  
    25  //sysnb pipe(p *[2]_C_int) (err error)
    26  
    27  func Pipe(p []int) (err error) {
    28  	if len(p) != 2 {
    29  		return EINVAL
    30  	}
    31  	var pp [2]_C_int
    32  	// Try pipe2 first for Android O, then try pipe for kernel 2.6.23.
    33  	err = pipe2(&pp, 0)
    34  	if err == ENOSYS {
    35  		err = pipe(&pp)
    36  	}
    37  	p[0] = int(pp[0])
    38  	p[1] = int(pp[1])
    39  	return
    40  }
    41  
    42  //sysnb pipe2(p *[2]_C_int, flags int) (err error)
    43  
    44  func Pipe2(p []int, flags int) (err error) {
    45  	if len(p) != 2 {
    46  		return EINVAL
    47  	}
    48  	var pp [2]_C_int
    49  	err = pipe2(&pp, flags)
    50  	p[0] = int(pp[0])
    51  	p[1] = int(pp[1])
    52  	return
    53  }
    54  
    55  // Underlying system call writes to newoffset via pointer.
    56  // Implemented in assembly to avoid allocation.
    57  func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)
    58  
    59  func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
    60  	newoffset, errno := seek(fd, offset, whence)
    61  	if errno != 0 {
    62  		return 0, errno
    63  	}
    64  	return newoffset, nil
    65  }
    66  
    67  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
    68  //sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
    69  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    70  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    71  //sysnb	getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
    72  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
    73  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
    74  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
    75  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    76  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    77  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
    78  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
    79  //sysnb	socketpair(domain int, typ int, flags int, fd *[2]int32) (err error)
    80  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
    81  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
    82  
    83  // 64-bit file system and 32-bit uid calls
    84  // (16-bit uid calls are not always supported in newer kernels)
    85  //sys	Dup2(oldfd int, newfd int) (err error)
    86  //sysnb	EpollCreate(size int) (fd int, err error)
    87  //sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
    88  //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
    89  //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
    90  //sysnb	Getegid() (egid int) = SYS_GETEGID32
    91  //sysnb	Geteuid() (euid int) = SYS_GETEUID32
    92  //sysnb	Getgid() (gid int) = SYS_GETGID32
    93  //sysnb	Getuid() (uid int) = SYS_GETUID32
    94  //sysnb	InotifyInit() (fd int, err error)
    95  //sys	Listen(s int, n int) (err error)
    96  //sys	Pause() (err error)
    97  //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
    98  //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
    99  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
   100  //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
   101  //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
   102  //sys	Shutdown(fd int, how int) (err error)
   103  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
   104  //sys	Ustat(dev int, ubuf *Ustat_t) (err error)
   105  
   106  //sys	futimesat(dirfd int, path string, times *[2]Timeval) (err error)
   107  //sysnb	Gettimeofday(tv *Timeval) (err error)
   108  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   109  //sys	Utime(path string, buf *Utimbuf) (err error)
   110  //sys	utimes(path string, times *[2]Timeval) (err error)
   111  
   112  //sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
   113  //sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
   114  //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
   115  //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
   116  
   117  //sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
   118  //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
   119  
   120  func Stat(path string, stat *Stat_t) (err error) {
   121  	return fstatat(_AT_FDCWD, path, stat, 0)
   122  }
   123  
   124  func Lchown(path string, uid int, gid int) (err error) {
   125  	return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
   126  }
   127  
   128  func Lstat(path string, stat *Stat_t) (err error) {
   129  	return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
   130  }
   131  
   132  func Fstatfs(fd int, buf *Statfs_t) (err error) {
   133  	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   134  	if e != 0 {
   135  		err = e
   136  	}
   137  	return
   138  }
   139  
   140  func Statfs(path string, buf *Statfs_t) (err error) {
   141  	pathp, err := BytePtrFromString(path)
   142  	if err != nil {
   143  		return err
   144  	}
   145  	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   146  	if e != 0 {
   147  		err = e
   148  	}
   149  	return
   150  }
   151  
   152  func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
   153  	page := uintptr(offset / 4096)
   154  	if offset != int64(page)*4096 {
   155  		return 0, EINVAL
   156  	}
   157  	return mmap2(addr, length, prot, flags, fd, page)
   158  }
   159  
   160  type rlimit32 struct {
   161  	Cur uint32
   162  	Max uint32
   163  }
   164  
   165  //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
   166  
   167  const rlimInf32 = ^uint32(0)
   168  const rlimInf64 = ^uint64(0)
   169  
   170  func Getrlimit(resource int, rlim *Rlimit) (err error) {
   171  	err = prlimit(0, resource, nil, rlim)
   172  	if err != ENOSYS {
   173  		return err
   174  	}
   175  
   176  	rl := rlimit32{}
   177  	err = getrlimit(resource, &rl)
   178  	if err != nil {
   179  		return
   180  	}
   181  
   182  	if rl.Cur == rlimInf32 {
   183  		rlim.Cur = rlimInf64
   184  	} else {
   185  		rlim.Cur = uint64(rl.Cur)
   186  	}
   187  
   188  	if rl.Max == rlimInf32 {
   189  		rlim.Max = rlimInf64
   190  	} else {
   191  		rlim.Max = uint64(rl.Max)
   192  	}
   193  	return
   194  }
   195  
   196  //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
   197  
   198  func Setrlimit(resource int, rlim *Rlimit) (err error) {
   199  	err = prlimit(0, resource, rlim, nil)
   200  	if err != ENOSYS {
   201  		return err
   202  	}
   203  
   204  	rl := rlimit32{}
   205  	if rlim.Cur == rlimInf64 {
   206  		rl.Cur = rlimInf32
   207  	} else if rlim.Cur < uint64(rlimInf32) {
   208  		rl.Cur = uint32(rlim.Cur)
   209  	} else {
   210  		return EINVAL
   211  	}
   212  	if rlim.Max == rlimInf64 {
   213  		rl.Max = rlimInf32
   214  	} else if rlim.Max < uint64(rlimInf32) {
   215  		rl.Max = uint32(rlim.Max)
   216  	} else {
   217  		return EINVAL
   218  	}
   219  
   220  	return setrlimit(resource, &rl)
   221  }
   222  
   223  func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }
   224  
   225  func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }
   226  
   227  func (iov *Iovec) SetLen(length int) {
   228  	iov.Len = uint32(length)
   229  }
   230  
   231  func (msghdr *Msghdr) SetControllen(length int) {
   232  	msghdr.Controllen = uint32(length)
   233  }
   234  
   235  func (cmsg *Cmsghdr) SetLen(length int) {
   236  	cmsg.Len = uint32(length)
   237  }
   238  
   239  func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno)
   240  

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