perf_event_open.c

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// SPDX-License-Identifier: GPL-2.0
#ifndef PERF_FLAG_FD_NO_GROUP
# define PERF_FLAG_FD_NO_GROUP      (1UL << 0)
#endif

#ifndef PERF_FLAG_FD_OUTPUT
# define PERF_FLAG_FD_OUTPUT        (1UL << 1)
#endif

#ifndef PERF_FLAG_PID_CGROUP
# define PERF_FLAG_PID_CGROUP       (1UL << 2) /* pid=cgroup id, per-cpu mode only */
#endif

#ifndef PERF_FLAG_FD_CLOEXEC
# define PERF_FLAG_FD_CLOEXEC       (1UL << 3) /* O_CLOEXEC */
#endif

static size_t syscall_arg__scnprintf_perf_flags(char *bf, size_t size,
                        struct syscall_arg *arg)
{
    int printed = 0, flags = arg->val;

    if (flags == 0)
        return 0;

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

    P_FLAG(FD_NO_GROUP);
    P_FLAG(FD_OUTPUT);
    P_FLAG(PID_CGROUP);
    P_FLAG(FD_CLOEXEC);
#undef P_FLAG

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

    return printed;
}

#define SCA_PERF_FLAGS syscall_arg__scnprintf_perf_flags