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| author | David Thompson <dthompson2@worcester.edu> | 2015-09-05 14:10:08 -0400 |
|---|---|---|
| committer | David Thompson <dthompson2@worcester.edu> | 2015-09-07 13:09:58 -0400 |
| commit | ee78d02452208b3cfd971cd5533570a1d3523512 (patch) | |
| tree | dec78f69c53cae84fee251273f62804a2358a71d | |
| parent | 4949ada9da470b266063ff490438c85541af24cc (diff) | |
| download | guix-ee78d02452208b3cfd971cd5533570a1d3523512.tar.gz guix-ee78d02452208b3cfd971cd5533570a1d3523512.zip | |
build: container: Use the same clone flags as fork(3).
The intent is to make 'clone' behave a lot more like 'primitive-fork', which
calls clone(2) with SIGCHLD, CLONE_CHILD_CLEARTID, and CLONE_CHILD_SETTID
flags. Notably, running 'clone' at the REPL without these flags would break
the REPL beyond repair.
* guix/build/syscalls.scm (CLONE_CHILD_CLEARTID, CLONE_CHILD_SETTID): New
variables.
* gnu/build/linux-container.scm (namespaces->bit-mask): Add
CLONE_CHILD_CLEARTID and CLONE_CHILD_SETTID to bit mask.
| -rw-r--r-- | gnu/build/linux-container.scm | 3 | ||||
| -rw-r--r-- | guix/build/syscalls.scm | 16 |
2 files changed, 12 insertions, 7 deletions
diff --git a/gnu/build/linux-container.scm b/gnu/build/linux-container.scm index c004303f03..95220d0bc0 100644 --- a/gnu/build/linux-container.scm +++ b/gnu/build/linux-container.scm @@ -162,7 +162,8 @@ host user identifiers to map into the user namespace." (define (namespaces->bit-mask namespaces) "Return the number suitable for the 'flags' argument of 'clone' that corresponds to the symbols in NAMESPACES." - (apply logior SIGCHLD + ;; Use the same flags as fork(3) in addition to the namespace flags. + (apply logior SIGCHLD CLONE_CHILD_CLEARTID CLONE_CHILD_SETTID (map (match-lambda ('mnt CLONE_NEWNS) ('uts CLONE_NEWUTS) diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm index 093eb0a1a0..2c2fbde0a3 100644 --- a/guix/build/syscalls.scm +++ b/guix/build/syscalls.scm @@ -50,6 +50,8 @@ mkdtemp! pivot-root + CLONE_CHILD_CLEARTID + CLONE_CHILD_SETTID CLONE_NEWNS CLONE_NEWUTS CLONE_NEWIPC @@ -303,12 +305,14 @@ string TMPL and return its file name. TMPL must end with 'XXXXXX'." (pointer->string result))))) ;; Linux clone flags, from linux/sched.h -(define CLONE_NEWNS #x00020000) -(define CLONE_NEWUTS #x04000000) -(define CLONE_NEWIPC #x08000000) -(define CLONE_NEWUSER #x10000000) -(define CLONE_NEWPID #x20000000) -(define CLONE_NEWNET #x40000000) +(define CLONE_CHILD_CLEARTID #x00200000) +(define CLONE_CHILD_SETTID #x01000000) +(define CLONE_NEWNS #x00020000) +(define CLONE_NEWUTS #x04000000) +(define CLONE_NEWIPC #x08000000) +(define CLONE_NEWUSER #x10000000) +(define CLONE_NEWPID #x20000000) +(define CLONE_NEWNET #x40000000) ;; The libc interface to sys_clone is not useful for Scheme programs, so the ;; low-level system call is wrapped instead. |