filesystems/spufs/spufs.rst

20        The file system provides a name space similar to posix shared memory or
22        can use spu_create(2) to establish SPU contexts in the spufs root.
24        Every SPU context is represented by a directory containing a predefined
44        tem  calls like read(2) or write(2), but often support only a subset of
49        All files that support the read(2) operation also support readv(2)  and
50        all  files  that support the write(2) operation also support writev(2).
51        All files support the access(2) and stat(2) family of  operations,  but
55        All files support the chmod(2)/fchmod(2) and chown(2)/fchown(2)  opera-
64        accessed  like  a regular shared memory file and contains both code and
68        read(2), pread(2), write(2), pwrite(2), lseek(2)
69               These  operate  as  documented, with the exception that seek(2),
70               write(2) and pwrite(2) are not supported beyond the end  of  the
74        mmap(2)
86        read(2)
87               If  a  count smaller than four is requested, read returns -1 and
100        read(2)
101               If a count smaller than four is requested, read returns  -1  and
112        poll(2)
121        operations  on  an open wbox file are: write(2) If a count smaller than
133        poll(2)
142        units  and  return  a  big-endian  binary integer number.  The possible
145        read(2)
146               If a count smaller than four is requested, read returns  -1  and
147               sets errno to EINVAL.  Otherwise, a four byte value is placed in
176        read(2)
178               required  length for the pointer value plus a newline character,
181               a running SPU task.  When a complete string has been  read,  all
182               subsequent read operations will return zero bytes and a new file
185        write(2)
186               A write operation on the file results in setting the register to
195        ter as a four byte long file. The operations on the fpcr file are:
197        read(2)
198               If  a  count smaller than four is requested, read returns -1 and
199               sets errno to EINVAL.  Otherwise, a four byte value is placed in
203        write(2)
204               If a count smaller than four is requested, write returns -1  and
205               sets  errno  to  EINVAL.  Otherwise, a four byte value is copied
211        files  that  operate  on  a 32 bit word.  Writing to one of these files
213        files can be read from the SPU through a channel read or from host user
218        read(2)
219               If a count smaller than four is requested, read returns  -1  and
220               sets errno to EINVAL.  Otherwise, a four byte value is placed in
224        write(2)
225               If  a count smaller than four is requested, write returns -1 and
226               sets errno to EINVAL.  Otherwise, a four byte  value  is  copied
237        cation  files.  The  contain  a numerical ASCII string which is read as
244        read(2)
246               required  length  for the digit plus a newline character, subse-
248               pleting  the  string.  When a complete string has been read, all
249               subsequent read operations will return zero bytes and a new file
252        write(2)
253               A write operation on the file results in setting the register to
273        capabilities(7), close(2), spu_create(2), spu_run(2), spufs(7)