Lines Matching +full:write +full:- +full:only
1 .. SPDX-License-Identifier: GPL-2.0
10 spufs - the SPU file system
21 message queues. Users that have write permissions on the file system
26 logical SPU. Users can change permissions on those files, but not actu-
43 The files in spufs mostly follow the standard behavior for regular sys-
44 tem calls like read(2) or write(2), but often support only a subset of
50 all files that support the write(2) operation also support writev(2).
52 only the st_mode, st_nlink, st_uid and st_gid fields of struct stat
55 All files support the chmod(2)/fchmod(2) and chown(2)/fchown(2) opera-
68 read(2), pread(2), write(2), pwrite(2), lseek(2)
70 write(2) and pwrite(2) are not supported beyond the end of the
76 SPU local storage within the process address space. Only
81 The first SPU to CPU communication mailbox. This file is read-only and
82 can be read in units of 32 bits. The file can only be used in non-
87 If a count smaller than four is requested, read returns -1 and
89 box, the return value is set to -1 and errno becomes EAGAIN.
101 If a count smaller than four is requested, read returns -1 and
104 return value is set to -1 and errno becomes EAGAIN.
118 The CPU to SPU communation mailbox. It is write-only and can be written
119 in units of 32 bits. If the mailbox is full, write() will block and
121 operations on an open wbox file are: write(2) If a count smaller than
122 four is requested, write returns -1 and sets errno to EINVAL. If there
124 opened with O_NONBLOCK, the return value is set to -1 and errno becomes
129 reads from its PPE mailbox channel. When data has been read success-
139 Read-only files that contain the length of the current queue, i.e. how
141 written to wbox without blocking. The files can be read only in 4-byte
142 units and return a big-endian binary integer number. The possible
146 If a count smaller than four is requested, read returns -1 and
157 can be used in read/write mode for debugging, but normal operation of
185 write(2)
186 A write operation on the file results in setting the register to
188 beginning to the first non-numeric character or the end of the
194 This file gives access to the Floating Point Status and Control Regis-
198 If a count smaller than four is requested, read returns -1 and
200 the data buffer, containing the current value of the fpcr regis-
203 write(2)
204 If a count smaller than four is requested, write returns -1 and
210 The two signal notification channels of an SPU. These are read-write
215 is reset to zero. The possible operations on an open signal1 or sig-
219 If a count smaller than four is requested, read returns -1 and
224 write(2)
225 If a count smaller than four is requested, write returns -1 and
236 These two files change the behavior of the signal1 and signal2 notifi-
240 mode 1 (logical OR), the hardware accumulates the bits that are subse-
246 required length for the digit plus a newline character, subse-
247 quent reads from the same file descriptor will result in com-
252 write(2)
253 A write operation on the file results in setting the register to
255 beginning to the first non-numeric character or the end of the