if available use a Child's pidfd for kill/wait #117957

the8472 · 2023-11-16T01:07:32Z

This should get us closer to stabilization of pidfds since they now do something useful. And they're CLOEXEC now.

$ strace -ffe clone,sendmsg,recvmsg,execve,kill,pidfd_open,pidfd_send_signal,waitpid,waitid ./x test std --no-doc -- pidfd

[...]
running 1 tests
strace: Process 816007 attached
[pid 816007] pidfd_open(816006, 0)      = 3
[pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f0c6b787990) = 816008
strace: Process 816008 attached
[pid 816007] recvmsg(3,  <unfinished ...>
[pid 816008] pidfd_open(816008, 0)      = 3
[pid 816008] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0
[pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[4]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0
[pid 816008] execve("/usr/bin/false", ["false"], 0x7ffcf2100048 /* 105 vars */) = 0
[pid 816007] waitid(P_PIDFD, 4,  <unfinished ...>
[pid 816008] +++ exited with 1 +++
[pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0}, WEXITED, NULL) = 0
[pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0} ---
[pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 816009 attached
, child_tidptr=0x7f0c6b787990) = 816009
[pid 816007] recvmsg(3,  <unfinished ...>
[pid 816009] pidfd_open(816009, 0)      = 3
[pid 816009] sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0
[pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[5]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0
[pid 816009] execve("/usr/bin/sleep", ["sleep", "1000"], 0x7ffcf2100048 /* 105 vars */) = 0
[pid 816007] waitid(P_PIDFD, 5, {}, WNOHANG|WEXITED, NULL) = 0
[pid 816007] pidfd_send_signal(5, SIGKILL, NULL, 0) = 0
[pid 816007] waitid(P_PIDFD, 5,  <unfinished ...>
[pid 816009] +++ killed by SIGKILL +++
[pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0}, WEXITED, NULL) = 0
[pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0} ---
[pid 816007] +++ exited with 0 +++

rustbot · 2023-11-16T01:07:41Z

r? @Mark-Simulacrum

(rustbot has picked a reviewer for you, use r? to override)

Mark-Simulacrum · 2023-11-18T17:15:14Z

@bors r+

bors · 2023-11-18T17:15:16Z

📌 Commit 12efa53 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

bors · 2023-11-19T04:57:40Z

⌛ Testing commit 12efa53 with merge e71a414...

if available use a Child's pidfd for kill/wait This should get us closer to stabilization of pidfds since they now do something useful. And they're `CLOEXEC` now. ``` $ strace -ffe clone,sendmsg,recvmsg,execve,kill,pidfd_open,pidfd_send_signal,waitpid,waitid ./x test std --no-doc -- pidfd [...] running 1 tests strace: Process 816007 attached [pid 816007] pidfd_open(816006, 0) = 3 [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f0c6b787990) = 816008 strace: Process 816008 attached [pid 816007] recvmsg(3, <unfinished ...> [pid 816008] pidfd_open(816008, 0) = 3 [pid 816008] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[4]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816008] execve("/usr/bin/false", ["false"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 4, <unfinished ...> [pid 816008] +++ exited with 1 +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0} --- [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 816009 attached , child_tidptr=0x7f0c6b787990) = 816009 [pid 816007] recvmsg(3, <unfinished ...> [pid 816009] pidfd_open(816009, 0) = 3 [pid 816009] sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[5]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816009] execve("/usr/bin/sleep", ["sleep", "1000"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 5, {}, WNOHANG|WEXITED, NULL) = 0 [pid 816007] pidfd_send_signal(5, SIGKILL, NULL, 0) = 0 [pid 816007] waitid(P_PIDFD, 5, <unfinished ...> [pid 816009] +++ killed by SIGKILL +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0} --- [pid 816007] +++ exited with 0 +++ ```

bors · 2023-11-19T05:34:01Z

💔 Test failed - checks-actions

the8472 · 2023-11-19T14:28:09Z

Looks like create_pidfd(true) was broken on older kernels and the test didn't catch that previously. sendmsg returned EINVAL when the cmsg fields point to an empty cmsg list.

Mark-Simulacrum · 2023-11-19T20:21:12Z

@bors r+

bors · 2023-11-19T20:21:15Z

📌 Commit f34e7f4 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

if available use a Child's pidfd for kill/wait This should get us closer to stabilization of pidfds since they now do something useful. And they're `CLOEXEC` now. ``` $ strace -ffe clone,sendmsg,recvmsg,execve,kill,pidfd_open,pidfd_send_signal,waitpid,waitid ./x test std --no-doc -- pidfd [...] running 1 tests strace: Process 816007 attached [pid 816007] pidfd_open(816006, 0) = 3 [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f0c6b787990) = 816008 strace: Process 816008 attached [pid 816007] recvmsg(3, <unfinished ...> [pid 816008] pidfd_open(816008, 0) = 3 [pid 816008] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[4]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816008] execve("/usr/bin/false", ["false"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 4, <unfinished ...> [pid 816008] +++ exited with 1 +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0} --- [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 816009 attached , child_tidptr=0x7f0c6b787990) = 816009 [pid 816007] recvmsg(3, <unfinished ...> [pid 816009] pidfd_open(816009, 0) = 3 [pid 816009] sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[5]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816009] execve("/usr/bin/sleep", ["sleep", "1000"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 5, {}, WNOHANG|WEXITED, NULL) = 0 [pid 816007] pidfd_send_signal(5, SIGKILL, NULL, 0) = 0 [pid 816007] waitid(P_PIDFD, 5, <unfinished ...> [pid 816009] +++ killed by SIGKILL +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0} --- [pid 816007] +++ exited with 0 +++ ```

…mpiler-errors Rollup of 8 pull requests Successful merges: - rust-lang#115526 (Add arm64e-apple-ios & arm64e-apple-darwin targets) - rust-lang#115691 (Add `$message_type` field to distinguish json diagnostic outputs) - rust-lang#117828 (Avoid iterating over hashmaps in astconv) - rust-lang#117832 (interpret: simplify handling of shifts by no longer trying to handle signed and unsigned shift amounts in the same branch) - rust-lang#117891 (Recover `dyn` and `impl` after `for<...>`) - rust-lang#117957 (if available use a Child's pidfd for kill/wait) - rust-lang#117994 (Ignore but do not assume region obligations from unifying headers in negative coherence) - rust-lang#118068 (subtree update cg_gcc 2023/11/17) r? `@ghost` `@rustbot` modify labels: rollup

…mpiler-errors Rollup of 8 pull requests Successful merges: - rust-lang#117828 (Avoid iterating over hashmaps in astconv) - rust-lang#117832 (interpret: simplify handling of shifts by no longer trying to handle signed and unsigned shift amounts in the same branch) - rust-lang#117891 (Recover `dyn` and `impl` after `for<...>`) - rust-lang#117957 (if available use a Child's pidfd for kill/wait) - rust-lang#117988 (Handle attempts to have multiple `cfg`d tail expressions) - rust-lang#117994 (Ignore but do not assume region obligations from unifying headers in negative coherence) - rust-lang#118000 (Make regionck care about placeholders in outlives components) - rust-lang#118068 (subtree update cg_gcc 2023/11/17) r? `@ghost` `@rustbot` modify labels: rollup

…tthiaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#117828 (Avoid iterating over hashmaps in astconv) - rust-lang#117832 (interpret: simplify handling of shifts by no longer trying to handle signed and unsigned shift amounts in the same branch) - rust-lang#117891 (Recover `dyn` and `impl` after `for<...>`) - rust-lang#117957 (if available use a Child's pidfd for kill/wait) - rust-lang#117988 (Handle attempts to have multiple `cfg`d tail expressions) - rust-lang#117994 (Ignore but do not assume region obligations from unifying headers in negative coherence) - rust-lang#118000 (Make regionck care about placeholders in outlives components) - rust-lang#118068 (subtree update cg_gcc 2023/11/17) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#117957 - the8472:pidfd-wait, r=Mark-Simulacrum if available use a Child's pidfd for kill/wait This should get us closer to stabilization of pidfds since they now do something useful. And they're `CLOEXEC` now. ``` $ strace -ffe clone,sendmsg,recvmsg,execve,kill,pidfd_open,pidfd_send_signal,waitpid,waitid ./x test std --no-doc -- pidfd [...] running 1 tests strace: Process 816007 attached [pid 816007] pidfd_open(816006, 0) = 3 [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f0c6b787990) = 816008 strace: Process 816008 attached [pid 816007] recvmsg(3, <unfinished ...> [pid 816008] pidfd_open(816008, 0) = 3 [pid 816008] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[4]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816008] execve("/usr/bin/false", ["false"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 4, <unfinished ...> [pid 816008] +++ exited with 1 +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=816008, si_uid=1001, si_status=1, si_utime=0, si_stime=0} --- [pid 816007] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 816009 attached , child_tidptr=0x7f0c6b787990) = 816009 [pid 816007] recvmsg(3, <unfinished ...> [pid 816009] pidfd_open(816009, 0) = 3 [pid 816009] sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, 0) = 0 [pid 816007] <... recvmsg resumed>{msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="", iov_len=0}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[5]}], msg_controllen=24, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 0 [pid 816009] execve("/usr/bin/sleep", ["sleep", "1000"], 0x7ffcf2100048 /* 105 vars */) = 0 [pid 816007] waitid(P_PIDFD, 5, {}, WNOHANG|WEXITED, NULL) = 0 [pid 816007] pidfd_send_signal(5, SIGKILL, NULL, 0) = 0 [pid 816007] waitid(P_PIDFD, 5, <unfinished ...> [pid 816009] +++ killed by SIGKILL +++ [pid 816007] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0}, WEXITED, NULL) = 0 [pid 816007] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=816009, si_uid=1001, si_status=SIGKILL, si_utime=0, si_stime=0} --- [pid 816007] +++ exited with 0 +++ ```

Add PidFd::{kill, wait, try_wait} rust-lang#117957 changed `Child` kill/wait/try_wait to use its pidfd instead of the pid, when one is available. This PR extracts those implementations and makes them available on `PidFd` directly. The `PidFd` implementations differ significantly from the corresponding `Child` methods: * the methods can be called after the child has been reaped, which will result in an error but will be safe. This state is not observable in `Child` unless something stole the zombie child * the `ExitStatus` is not kept, meaning that only the first time a wait succeeds it will be returned * `wait` does not close stdin * `wait` only requires `&self` instead of `&mut self` since there is no state to maintain and subsequent calls are safe Tracking issue: rust-lang#82971

the8472 added 3 commits November 16, 2023 01:36

set CLOEXEC on pidfd received from child process

10127d9

update comment, we're currently using a different syscall

3ffbb48

if available use a Child's pidfd for kill/wait

12efa53

the8472 added the O-linux Operating system: Linux label Nov 16, 2023

rustbot assigned Mark-Simulacrum Nov 16, 2023

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Tracking Issue for linux_pidfd #82971

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Don't set cmsg fields in msghdr if we have no cmsg to send

f34e7f4

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compiler-errors mentioned this pull request Nov 20, 2023

Rollup of 8 pull requests #118078

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compiler-errors mentioned this pull request Nov 20, 2023

Rollup of 8 pull requests #118082

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bors merged commit 6d33e90 into rust-lang:master Nov 20, 2023
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qarmin mentioned this pull request Nov 22, 2023

undefined reference to `waitid' sunfishcode/c-ward#75

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the8472 mentioned this pull request Nov 23, 2023

no method named si_pid found for struct siginfo_t for armv7-unknown-linux-uclibceabihf #118190

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the8472 mentioned this pull request Apr 17, 2024

Add PidFd::{kill, wait, try_wait} #124101

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if available use a Child's pidfd for kill/wait #117957

if available use a Child's pidfd for kill/wait #117957

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if available use a Child's pidfd for kill/wait #117957

if available use a Child's pidfd for kill/wait #117957

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