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https://github.com/checkpoint-restore/criu.git
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405985e964
Since we need to operate with sysctls pretty heavy, better to add some common engine for all handlers. Based-on-patch-from: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com>
33 lines
718 B
C
33 lines
718 B
C
#ifndef CR_SYSCTL_H_
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#define CR_SYSCTL_H_
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struct sysctl_req {
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char *name;
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void *arg;
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int type;
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};
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extern int sysctl_op(struct sysctl_req *req, int op);
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enum {
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CTL_READ,
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CTL_WRITE,
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CTL_PRINT,
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};
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#define CTL_SHIFT 4 /* Up to 16 types */
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#define CTL_U32 1 /* Single u32 */
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#define CTL_U64 2 /* Single u64 */
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#define __CTL_U32A 3 /* Array of u32 */
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#define __CTL_U64A 4 /* Array of u64 */
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#define __CTL_STR 5 /* String */
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#define CTL_U32A(n) (__CTL_U32A | ((n) << CTL_SHIFT))
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#define CTL_U64A(n) (__CTL_U64A | ((n) << CTL_SHIFT))
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#define CTL_STR(len) (__CTL_STR | ((len) << CTL_SHIFT))
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#define CTL_LEN(t) ((t) >> CTL_SHIFT)
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#define CTL_TYPE(t) ((t) & ((1 << CTL_SHIFT) - 1))
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#endif /* CR_SYSCTL_H_ */
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