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| author | Gregory Nutt <gnutt@nuttx.org> | 2015-03-13 07:21:06 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2015-03-13 07:21:06 -0600 |
| commit | 8f1f3579e61e3fdbdc7fadfdbedf264c89dc4dca (patch) | |
| tree | 714ecad73f67f764898afc1accdd1e0b903e1723 /nuttx/drivers | |
| parent | 41bb6f24d5787d90ef47004a3c4d58de5974f000 (diff) | |
| download | px4-nuttx-8f1f3579e61e3fdbdc7fadfdbedf264c89dc4dca.tar.gz px4-nuttx-8f1f3579e61e3fdbdc7fadfdbedf264c89dc4dca.tar.bz2 px4-nuttx-8f1f3579e61e3fdbdc7fadfdbedf264c89dc4dca.zip | |
Pipes: Fix zero-lenth writes. From Jussi Kivilinna
Diffstat (limited to 'nuttx/drivers')
| -rw-r--r-- | nuttx/drivers/pipes/pipe_common.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/nuttx/drivers/pipes/pipe_common.c b/nuttx/drivers/pipes/pipe_common.c index 026c11ab5..b4cdfc2e2 100644 --- a/nuttx/drivers/pipes/pipe_common.c +++ b/nuttx/drivers/pipes/pipe_common.c @@ -384,6 +384,11 @@ ssize_t pipecommon_read(FAR struct file *filep, FAR char *buffer, size_t len) DEBUGASSERT(dev); + if (len == 0) + { + return 0; + } + /* Make sure that we have exclusive access to the device structure */ if (sem_wait(&dev->d_bfsem) < 0) @@ -469,6 +474,11 @@ ssize_t pipecommon_write(FAR struct file *filep, FAR const char *buffer, size_t DEBUGASSERT(dev); pipe_dumpbuffer("To PIPE:", (uint8_t*)buffer, len); + if (len == 0) + { + return 0; + } + /* At present, this method cannot be called from interrupt handlers. That is * because it calls sem_wait (via pipecommon_semtake below) and sem_wait cannot * be called from interrupt level. This actually happens fairly commonly |