tools/perf/trace/beauty/clone.c

   1 /*
   2  * trace/beauty/cone.c
   3  *
   4  *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   5  *
   6  * Released under the GPL v2. (and only v2, not any later version)
   7  */
   8
   9 #include "trace/beauty/beauty.h"
  10 #include <linux/kernel.h>
  11 #include <sys/types.h>
  12 #include <uapi/linux/sched.h>
  13
  14 static size_t clone__scnprintf_flags(unsigned long flags, char *bf, size_t size)
  15 {
  16         int printed = 0;
  17
  18 #define P_FLAG(n) \
  19         if (flags & CLONE_##n) { \
  20                 printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
  21                 flags &= ~CLONE_##n; \
  22         }
  23
  24         P_FLAG(VM);
  25         P_FLAG(FS);
  26         P_FLAG(FILES);
  27         P_FLAG(SIGHAND);
  28         P_FLAG(PTRACE);
  29         P_FLAG(VFORK);
  30         P_FLAG(PARENT);
  31         P_FLAG(THREAD);
  32         P_FLAG(NEWNS);
  33         P_FLAG(SYSVSEM);
  34         P_FLAG(SETTLS);
  35         P_FLAG(PARENT_SETTID);
  36         P_FLAG(CHILD_CLEARTID);
  37         P_FLAG(DETACHED);
  38         P_FLAG(UNTRACED);
  39         P_FLAG(CHILD_SETTID);
  40         P_FLAG(NEWCGROUP);
  41         P_FLAG(NEWUTS);
  42         P_FLAG(NEWIPC);
  43         P_FLAG(NEWUSER);
  44         P_FLAG(NEWPID);
  45         P_FLAG(NEWNET);
  46         P_FLAG(IO);
  47 #undef P_FLAG
  48
  49         if (flags)
  50                 printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
  51
  52         return printed;
  53 }
  54
  55 size_t syscall_arg__scnprintf_clone_flags(char *bf, size_t size, struct syscall_arg *arg)
  56 {
  57         unsigned long flags = arg->val;
  58         enum syscall_clone_args {
  59                 SCC_FLAGS         = (1 << 0),
  60                 SCC_CHILD_STACK   = (1 << 1),
  61                 SCC_PARENT_TIDPTR = (1 << 2),
  62                 SCC_CHILD_TIDPTR  = (1 << 3),
  63                 SCC_TLS           = (1 << 4),
  64         };
  65         if (!(flags & CLONE_PARENT_SETTID))
  66                 arg->mask |= SCC_PARENT_TIDPTR;
  67
  68         if (!(flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)))
  69                 arg->mask |= SCC_CHILD_TIDPTR;
  70
  71         if (!(flags & CLONE_SETTLS))
  72                 arg->mask |= SCC_TLS;
  73
  74         return clone__scnprintf_flags(flags, bf, size);
  75 }