kcmp.c

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/*
 * trace/beauty/kcmp.c
 *
 *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

#include "trace/beauty/beauty.h"
#include <linux/kernel.h>
#include <sys/types.h>
#include <machine.h>
#include <uapi/linux/kcmp.h>

#include "trace/beauty/generated/kcmp_type_array.c"

size_t syscall_arg__scnprintf_kcmp_idx(char *bf, size_t size, struct syscall_arg *arg)
{
    unsigned long fd = arg->val;
    int type = syscall_arg__val(arg, 2);
    pid_t pid;

    if (type != KCMP_FILE)
        return syscall_arg__scnprintf_long(bf, size, arg);

    pid = syscall_arg__val(arg, arg->idx == 3 ? 0 : 1); /* idx1 -> pid1, idx2 -> pid2 */
    return pid__scnprintf_fd(arg->trace, pid, fd, bf, size);
}

static size_t kcmp__scnprintf_type(int type, char *bf, size_t size)
{
    static DEFINE_STRARRAY(kcmp_types);
    return strarray__scnprintf(&strarray__kcmp_types, bf, size, "%d", type);
}

size_t syscall_arg__scnprintf_kcmp_type(char *bf, size_t size, struct syscall_arg *arg)
{
    unsigned long type = arg->val;

    if (type != KCMP_FILE)
        arg->mask |= (1 << 3) | (1 << 4); /* Ignore idx1 and idx2 */

    return kcmp__scnprintf_type(type, bf, size);
}