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| author | Ian Lewis <ianlewis@google.com> | 2019-11-26 18:19:47 -0800 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-11-26 18:21:09 -0800 |
| commit | 20279c305ece6a458006999c8dafc5672ca92803 (patch) | |
| tree | 086e072c05f1bc0f6f1b972774fad452b7bb6c35 /test/syscalls | |
| parent | 4a620c436dabbb0d5036e137bfdd44b945e3cff0 (diff) | |
Allow open(O_TRUNC) and (f)truncate for proc files.
This allows writable proc and devices files to be opened with O_CREAT|O_TRUNC.
This is encountered most frequently when interacting with proc or devices files
via the command line.
e.g. $ echo 8192 1048576 4194304 > /proc/sys/net/ipv4/tcp_rmem
Also adds a test to test the behavior of open(O_TRUNC), truncate, and ftruncate
on named pipes.
Fixes #1116
PiperOrigin-RevId: 282677425
Diffstat (limited to 'test/syscalls')
| -rw-r--r-- | test/syscalls/linux/pipe.cc | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/test/syscalls/linux/pipe.cc b/test/syscalls/linux/pipe.cc index c0b354e65..ac9b21b24 100644 --- a/test/syscalls/linux/pipe.cc +++ b/test/syscalls/linux/pipe.cc @@ -212,6 +212,20 @@ TEST(Pipe2Test, BadOptions) { EXPECT_THAT(pipe2(fds, 0xDEAD), SyscallFailsWithErrno(EINVAL)); } +// Tests that opening named pipes with O_TRUNC shouldn't cause an error, but +// calls to (f)truncate should. +TEST(NamedPipeTest, Truncate) { + const std::string tmp_path = NewTempAbsPath(); + SKIP_IF(mkfifo(tmp_path.c_str(), 0644) != 0); + + ASSERT_THAT(open(tmp_path.c_str(), O_NONBLOCK | O_RDONLY), SyscallSucceeds()); + FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE( + Open(tmp_path.c_str(), O_RDWR | O_NONBLOCK | O_TRUNC)); + + ASSERT_THAT(truncate(tmp_path.c_str(), 0), SyscallFailsWithErrno(EINVAL)); + ASSERT_THAT(ftruncate(fd.get(), 0), SyscallFailsWithErrno(EINVAL)); +} + TEST_P(PipeTest, Seek) { SKIP_IF(!CreateBlocking()); |