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0a2418c327
Extract the duplicated generic netlink boilerplate (netlink_open,
send_request, get_family_id, and NLA walker macros) from cgroupstats.c and
taskstats_fill_stats_tgid.c into a shared netlink_helper.{h,c}.
Link: https://lore.kernel.org/a2adf27308b5cd90d50b59e8519b87da49486bee.1783876192.git.cyyzero16@gmail.com
Signed-off-by: Yiyang Chen <cyyzero16@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Balbir Singh <balbirs@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared generic netlink helpers for the acct selftests.
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*/
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#ifndef ACSELFTESTS_ACCT_NETLINK_HELPER_H
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#define ACSELFTESTS_ACCT_NETLINK_HELPER_H
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#include <stdbool.h>
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#include <linux/netlink.h>
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#ifndef NLA_ALIGNTO
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#define NLA_ALIGNTO 4
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#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
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#define NLA_HDRLEN ((int)NLA_ALIGN(sizeof(struct nlattr)))
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#endif
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/* Fail an individual test case instead of hanging the whole binary. */
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#define ACCT_RCV_TIMEOUT_SEC 2
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static inline void *nla_data(const struct nlattr *na)
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{
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return (void *)((char *)na + NLA_HDRLEN);
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}
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static inline bool nla_ok(const struct nlattr *na, int remaining)
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{
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return remaining >= (int)sizeof(*na) &&
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na->nla_len >= sizeof(*na) &&
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na->nla_len <= remaining;
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}
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static inline struct nlattr *nla_next(const struct nlattr *na, int *remaining)
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{
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int aligned_len = NLA_ALIGN(na->nla_len);
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*remaining -= aligned_len;
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return (struct nlattr *)((char *)na + aligned_len);
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}
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int netlink_open(void);
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int send_request(int fd, void *buf, size_t len);
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int get_family_id(int fd, const char *name);
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#endif /* ACSELFTESTS_ACCT_NETLINK_HELPER_H */
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