clone.c

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/*
 * trace/beauty/cone.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 <uapi/linux/sched.h>

static size_t clone__scnprintf_flags(unsigned long flags, char *bf, size_t size)
{
    int printed = 0;

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

    P_FLAG(VM);
    P_FLAG(FS);
    P_FLAG(FILES);
    P_FLAG(SIGHAND);
    P_FLAG(PTRACE);
    P_FLAG(VFORK);
    P_FLAG(PARENT);
    P_FLAG(THREAD);
    P_FLAG(NEWNS);
    P_FLAG(SYSVSEM);
    P_FLAG(SETTLS);
    P_FLAG(PARENT_SETTID);
    P_FLAG(CHILD_CLEARTID);
    P_FLAG(DETACHED);
    P_FLAG(UNTRACED);
    P_FLAG(CHILD_SETTID);
    P_FLAG(NEWCGROUP);
    P_FLAG(NEWUTS);
    P_FLAG(NEWIPC);
    P_FLAG(NEWUSER);
    P_FLAG(NEWPID);
    P_FLAG(NEWNET);
    P_FLAG(IO);
#undef P_FLAG

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

    return printed;
}

size_t syscall_arg__scnprintf_clone_flags(char *bf, size_t size, struct syscall_arg *arg)
{
    unsigned long flags = arg->val;
    enum syscall_clone_args {
        SCC_FLAGS     = (1 << 0),
        SCC_CHILD_STACK   = (1 << 1),
        SCC_PARENT_TIDPTR = (1 << 2),
        SCC_CHILD_TIDPTR  = (1 << 3),
        SCC_TLS       = (1 << 4),
    };
    if (!(flags & CLONE_PARENT_SETTID))
        arg->mask |= SCC_PARENT_TIDPTR;

    if (!(flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)))
        arg->mask |= SCC_CHILD_TIDPTR;

    if (!(flags & CLONE_SETTLS))
        arg->mask |= SCC_TLS;

    return clone__scnprintf_flags(flags, bf, size);
}