bfa4b901a1
Use unix.Prctl() instead of manually reimplementing it using unix.RawSyscall. Also use unix.PR_SET_CHILD_SUBREAPER unix.PR_GET_CHILD_SUBREAPER instead of locally defining them. Also fix the package name form 'osutils' to 'sys' in the package level comment. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
42 lines
1.5 KiB
Go
42 lines
1.5 KiB
Go
// +build linux
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// Package sys provides access to the Get Child and Set Child prctl flags.
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// See http://man7.org/linux/man-pages/man2/prctl.2.html
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package sys
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import (
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// GetSubreaper returns the subreaper setting for the calling process
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func GetSubreaper() (int, error) {
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var i uintptr
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// PR_GET_CHILD_SUBREAPER allows retrieving the current child
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// subreaper.
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// Returns the "child subreaper" setting of the caller, in the
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// location pointed to by (int *) arg2.
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if err := unix.Prctl(unix.PR_GET_CHILD_SUBREAPER, uintptr(unsafe.Pointer(&i)), 0, 0, 0); err != nil {
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return -1, err
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}
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return int(i), nil
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}
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// SetSubreaper sets the value i as the subreaper setting for the calling process
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func SetSubreaper(i int) error {
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// PR_SET_CHILD_SUBREAPER allows setting the child subreaper.
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// If arg2 is nonzero, set the "child subreaper" attribute of the
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// calling process; if arg2 is zero, unset the attribute. When a
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// process is marked as a child subreaper, all of the children
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// that it creates, and their descendants, will be marked as
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// having a subreaper. In effect, a subreaper fulfills the role
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// of init(1) for its descendant processes. Upon termination of
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// a process that is orphaned (i.e., its immediate parent has
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// already terminated) and marked as having a subreaper, the
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// nearest still living ancestor subreaper will receive a SIGCHLD
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// signal and be able to wait(2) on the process to discover its
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// termination status.
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return unix.Prctl(unix.PR_SET_CHILD_SUBREAPER, uintptr(i), 0, 0, 0)
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}
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