diff options
Diffstat (limited to 'trans/fifo.c')
| -rw-r--r-- | trans/fifo.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/trans/fifo.c b/trans/fifo.c index 4fe999dd..b40a50d1 100644 --- a/trans/fifo.c +++ b/trans/fifo.c @@ -424,12 +424,21 @@ trivfs_S_io_select (struct trivfs_protid *cred, if (cred->po->openmodes & O_READ) { pthread_mutex_lock (&pipe->lock); - if (pipe_wait_readable (pipe, 1, 1) != EWOULDBLOCK) - ready |= SELECT_READ; /* Data immediately readable (or error). */ + err = pipe_wait_readable (pipe, 1, 1); + if (err == EWOULDBLOCK) + err = 0; /* Not readable, actually not an error. */ + else + ready |= SELECT_READ; /* Data immediately readable (or error). */ pthread_mutex_unlock (&pipe->lock); } else - ready |= SELECT_READ; /* Error immediately available... */ + { + err = EBADF; + ready |= SELECT_READ; /* Error immediately available... */ + } + if (err) + /* Prevent write test from overwriting err. */ + *select_type &= ~SELECT_WRITE; } if (*select_type & SELECT_WRITE) @@ -437,12 +446,18 @@ trivfs_S_io_select (struct trivfs_protid *cred, if (cred->po->openmodes & O_WRITE) { pthread_mutex_lock (&pipe->lock); - if (pipe_wait_writable (pipe, 1) != EWOULDBLOCK) - ready |= SELECT_WRITE; /* Data immediately writable (or error). */ + err = pipe_wait_writable (pipe, 1); + if (err == EWOULDBLOCK) + err = 0; /* Not writable, actually not an error. */ + else + ready |= SELECT_WRITE; /* Data immediately writable (or error). */ pthread_mutex_unlock (&pipe->lock); } else - ready |= SELECT_WRITE; /* Error immediately available... */ + { + err = EBADF; + ready |= SELECT_WRITE; /* Error immediately available... */ + } } if (ready) |