/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PERF_TARGET_H
#define _PERF_TARGET_H

#include <stdbool.h>
#include <sys/types.h>

struct target {
        const char   *pid;
        const char   *tid;
        const char   *cpu_list;
        const char   *bpf_str;
        bool         system_wide;
        bool         uses_mmap;
        bool         default_per_cpu;
        bool         per_thread;
        bool         use_bpf;
        bool         inherit;
        int          initial_delay;
        const char   *attr_map;
};

enum target_errno {
        TARGET_ERRNO__SUCCESS           = 0,

        /*
         * Choose an arbitrary negative big number not to clash with standard
         * errno since SUS requires the errno has distinct positive values.
         * See 'Issue 6' in the link below.
         *
         * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
         */
        __TARGET_ERRNO__START           = -10000,

        /* for target__validate() */
        TARGET_ERRNO__PID_OVERRIDE_CPU  = __TARGET_ERRNO__START,
        TARGET_ERRNO__PID_OVERRIDE_SYSTEM,
        TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD,
        TARGET_ERRNO__BPF_OVERRIDE_CPU,
        TARGET_ERRNO__BPF_OVERRIDE_PID,
        TARGET_ERRNO__BPF_OVERRIDE_THREAD,

        __TARGET_ERRNO__END,
};

enum target_errno target__validate(struct target *target);

uid_t parse_uid(const char *str);

int target__strerror(struct target *target, int errnum, char *buf, size_t buflen);

static inline bool target__has_task(struct target *target)
{
        return target->tid || target->pid;
}

static inline bool target__has_cpu(struct target *target)
{
        return target->system_wide || target->cpu_list;
}

static inline bool target__none(struct target *target)
{
        return !target__has_task(target) && !target__has_cpu(target);
}

static inline bool target__enable_on_exec(struct target *target)
{
        /*
         * Normally enable_on_exec should be set if:
         *  1) The tracee process is forked (not attaching to existed task or cpu).
         *  2) And initial_delay is not configured.
         * Otherwise, we enable tracee events manually.
         */
        return target__none(target) && !target->initial_delay;
}

static inline bool target__has_per_thread(struct target *target)
{
        return target->system_wide && target->per_thread;
}

static inline bool target__uses_dummy_map(struct target *target)
{
        bool use_dummy = false;

        if (target->default_per_cpu)
                use_dummy = target->per_thread ? true : false;
        else if (target__has_task(target) ||
                 (!target__has_cpu(target) && !target->uses_mmap))
                use_dummy = true;
        else if (target__has_per_thread(target))
                use_dummy = true;

        return use_dummy;
}

#endif /* _PERF_TARGET_H */