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runc/nsenter/nsenter.go

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nsenter: fix the -Wunused-variable warning The change 699429e60f23ab0fa3bdd97b6326316be08791ad that allows the constructor attribute to not be optimized out on gccgo has resulted in a warning when compiling on the golang compiler. ``` ./nsenter.go: In function ‘_cgo_51505a0edd5d_Cfunc_init’: ./nsenter.go:40:49: warning: unused variable ‘a’ [-Wunused-variable] ``` the generated code produced an unused struct like: ``` void _cgo_d6cfae95ae01_Cfunc_init (void *v) { struct { char unused; } __attribute__ ((__packed__, __gcc_struct__)) * a = v; init (); } ``` Truly the "fix" would be upstream in cgo. If it knows it is producing an unused struct, then it should also include __attribute__ ((unused)) Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
2015-03-11 02:43:09 +08:00
// +build linux,!gccgo
Add build flag for nsenter file Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
2014-06-12 02:40:33 +08:00
Move nsenter code into separate package Signed-off-by: Michael Crosby <michael@docker.com>
2014-08-09 01:42:03 +08:00
package nsenter
Adding initial version of C-based nsenter for allowing execin in libcontainer. Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
2014-05-24 09:06:14 +08:00
/*
nsenter: remove a proxy process Currently nsexec() creates a proxy process to enter into a pid namespace. It isn't good, because we need to proxy an exit code and signals. We can use CLONE_PARENT to fork a process with the right parent. Signed-off-by: Andrey Vagin <avagin@openvz.org>
2015-01-26 16:33:56 +08:00
#cgo CFLAGS: -Wall
extern void nsexec();
nsenter: fix the -Wunused-variable warning The change 699429e60f23ab0fa3bdd97b6326316be08791ad that allows the constructor attribute to not be optimized out on gccgo has resulted in a warning when compiling on the golang compiler. ``` ./nsenter.go: In function ‘_cgo_51505a0edd5d_Cfunc_init’: ./nsenter.go:40:49: warning: unused variable ‘a’ [-Wunused-variable] ``` the generated code produced an unused struct like: ``` void _cgo_d6cfae95ae01_Cfunc_init (void *v) { struct { char unused; } __attribute__ ((__packed__, __gcc_struct__)) * a = v; init (); } ``` Truly the "fix" would be upstream in cgo. If it knows it is producing an unused struct, then it should also include __attribute__ ((unused)) Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
2015-03-11 02:43:09 +08:00
void __attribute__((constructor)) init(void) {
new-api: execute a process inside an existing container A new constructor function (like nsenter) is added in this patch. This function gets arguments from environment variables and its behaviour doesn't depend on a command line arguments. A program which calls factory.StartInitialization() must import the nsenter package. It looks ugly, but I don't know another way how to enter into CT from a go code. Signed-off-by: Andrey Vagin <avagin@openvz.org>
2014-12-23 06:06:22 +08:00
nsexec();
Adding initial version of C-based nsenter for allowing execin in libcontainer. Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
2014-05-24 09:06:14 +08:00
}
*/
import "C"