Update sys_pipe to sys_pipe2

[yukiiiteru]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 214816046

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 22 of 28 (78.57%) changed or added relevant lines in 5 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.1%) to 46.804%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
linux-object/src/fs/file.rs	0	1	0.0%
linux-syscall/src/file/fd.rs	9	10	90.0%
linux-syscall/src/lib.rs	0	1	0.0%
linux-object/src/process.rs	12	15	80.0%

Files with Coverage Reduction	New Missed Lines	%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/bitflags-1.2.1/src/lib.rs	1	42.2%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.7.2/src/map.rs	3	87.1%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.7.2/src/raw/mod.rs	3	80.45%

Totals
Change from base Build 213400297:	0.1%
Covered Lines:	6744
Relevant Lines:	14409

---

💛 - Coveralls

[wangrunji0408]

NOTE:
The cloexec flag can be set through fcntl(fd, F_SETFD, FD_CLOEXEC).
So it should be put into the inner or as an AtomicBool in the future.