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Diffstat (limited to 'libio/iopopen.c')
-rw-r--r--libio/iopopen.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/libio/iopopen.c b/libio/iopopen.c
index 65337f8..a03cf63 100644
--- a/libio/iopopen.c
+++ b/libio/iopopen.c
@@ -98,18 +98,23 @@ _IO_proc_open (fp, command, mode)
return NULL;
if (_IO_pipe (pipe_fds) < 0)
return NULL;
- if (mode[0] == 'r')
+ if (mode[0] == 'r' && mode[1] == '\0')
{
parent_end = pipe_fds[0];
child_end = pipe_fds[1];
read_or_write = _IO_NO_WRITES;
}
- else
+ else if (mode[0] == 'w' && mode[1] == '\0')
{
parent_end = pipe_fds[1];
child_end = pipe_fds[0];
read_or_write = _IO_NO_READS;
}
+ else
+ {
+ __set_errno (EINVAL);
+ return NULL;
+ }
((_IO_proc_file *) fp)->pid = child_pid = _IO_fork ();
if (child_pid == 0)
{