sched_policy.c

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// SPDX-License-Identifier: GPL-2.0
#include <sched.h>

/*
 * Not defined anywhere else, probably, just to make sure we
 * catch future flags
 */
#define SCHED_POLICY_MASK 0xff

#ifndef SCHED_DEADLINE
#define SCHED_DEADLINE 6
#endif
#ifndef SCHED_RESET_ON_FORK
#define SCHED_RESET_ON_FORK 0x40000000
#endif

static size_t syscall_arg__scnprintf_sched_policy(char *bf, size_t size,
                          struct syscall_arg *arg)
{
    const char *policies[] = {
        "NORMAL", "FIFO", "RR", "BATCH", "ISO", "IDLE", "DEADLINE",
    };
    size_t printed;
    int policy = arg->val,
        flags = policy & ~SCHED_POLICY_MASK;

    policy &= SCHED_POLICY_MASK;
    if (policy <= SCHED_DEADLINE)
        printed = scnprintf(bf, size, "%s", policies[policy]);
    else
        printed = scnprintf(bf, size, "%#x", policy);

#define P_POLICY_FLAG(n) \
    if (flags & SCHED_##n) { \
        printed += scnprintf(bf + printed, size - printed, "|%s", #n); \
        flags &= ~SCHED_##n; \
    }

    P_POLICY_FLAG(RESET_ON_FORK);
#undef P_POLICY_FLAG

    if (flags)
        printed += scnprintf(bf + printed, size - printed, "|%#x", flags);

    return printed;
}

#define SCA_SCHED_POLICY syscall_arg__scnprintf_sched_policy