Danny Canter
32cf8c4d32
There are some workloads that benefit from having a "true" init process
that reaps zombies. This change implements a minimal init as part of
vminitd and exposes an API to be able to use this init process in our
containers. signals will be forwarded, any child procs will be reaped
and the exit code of the actual workload will be propagated. The
LinuxContainer/LinuxPod API is a very simple bool to ask to use this as
our init process, and the init simply spawns whatever command you want
as a child underneath this.
```
➜ ./bin/cctl run --kernel bin/kernel.arm64 --init
/ # ps aux
PID USER TIME COMMAND
1 root 0:00 /.cz-init -- /bin/sh
2 root 0:00 /bin/sh
3 root 0:00 ps aux
```
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef exec_command_h
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#define exec_command_h
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#if defined(__linux__) || defined(__APPLE__)
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#include <sys/types.h>
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#include <unistd.h>
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struct exec_command_attrs {
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int setpgid;
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/// parent group id
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pid_t pgid;
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/// set the controlling terminal
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int setctty;
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/// controlling terminal fd
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int ctty;
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/// set the process as session leader
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int setsid;
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/// set the process user id
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uid_t uid;
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/// set the process group id
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gid_t gid;
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/// signal mask for the child process
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int mask;
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/// parent death signal (Linux only, 0 to disable)
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int pdeathSignal;
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/// make the new process group the foreground process group
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int setfgpgrp;
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};
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void exec_command_attrs_init(struct exec_command_attrs *attrs);
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/// spawn a new child process with the provided attrs
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int exec_command(pid_t *result, const char *executable, char *const argv[],
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char *const envp[], const int file_handles[],
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const int file_handle_count, const char *working_directory,
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struct exec_command_attrs *attrs);
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#endif /* defined(__linux__) || defined(__APPLE__) */
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#endif /* exec_command_h */
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