granicus.if.org Git - strace/blob - tests/perf_event_open_nonverbose.c

   1 /*
   2  * Check decoding of perf_event_open syscall.
   3  *
   4  * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
   5  * Copyright (c) 2016-2017 The strace developers.
   6  * All rights reserved.
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #include "tests.h"
  12 #include <asm/unistd.h>
  13
  14 #if defined(__NR_perf_event_open) && defined(HAVE_LINUX_PERF_EVENT_H)
  15
  16 # include <limits.h>
  17 # include <stdio.h>
  18 # include <unistd.h>
  19
  20 # include <linux/perf_event.h>
  21
  22 # include "xlat.h"
  23 # include "xlat/perf_event_open_flags.h"
  24
  25 #if ULONG_MAX > UINT_MAX
  26 #define LONG_STR_PREFIX "ffffffff"
  27 #else
  28 #define LONG_STR_PREFIX ""
  29 #endif
  30
  31 static const char *printaddr(void *ptr)
  32 {
  33         static char buf[sizeof("0x") + sizeof(void *) * 2];
  34
  35         if (ptr == NULL)
  36                 return "NULL";
  37
  38         snprintf(buf, sizeof(buf), "%#lx", (unsigned long)ptr);
  39
  40         return buf;
  41 }
  42
  43 int
  44 main(void)
  45 {
  46         TAIL_ALLOC_OBJECT_CONST_PTR(struct perf_event_attr, attr);
  47
  48         attr->type = PERF_TYPE_HARDWARE;
  49         attr->size = sizeof(*attr);
  50
  51         struct {
  52                 struct perf_event_attr *attr;
  53                 pid_t pid;
  54                 int cpu;
  55                 int group_fd;
  56                 unsigned long flags;
  57                 const char *flags_str;
  58         } args[] = {
  59                 { NULL,     0xfacef00d, 0xbadabba7, -1,
  60                         (unsigned long) 0xFFFFFFFFFFFFFFFFLLU,
  61                         "PERF_FLAG_FD_NO_GROUP|PERF_FLAG_FD_OUTPUT|"
  62                         "PERF_FLAG_PID_CGROUP|PERF_FLAG_FD_CLOEXEC|"
  63                         "0x" LONG_STR_PREFIX "fffffff0"
  64                         },
  65                 { attr + 1, 0,          0,          0,
  66                         0, "0" },
  67                 { attr,     -1,         -1,         1,
  68                         PERF_FLAG_FD_CLOEXEC, "PERF_FLAG_FD_CLOEXEC" },
  69                 { attr - 1, -100,       100,        0xface1e55,
  70                         PERF_FLAG_FD_NO_GROUP | PERF_FLAG_FD_OUTPUT |
  71                         PERF_FLAG_PID_CGROUP | PERF_FLAG_FD_CLOEXEC,
  72                         "PERF_FLAG_FD_NO_GROUP|PERF_FLAG_FD_OUTPUT|"
  73                         "PERF_FLAG_PID_CGROUP|PERF_FLAG_FD_CLOEXEC" },
  74         };
  75         size_t i;
  76         int rc;
  77
  78         for (i = 0; i < ARRAY_SIZE(args); i++) {
  79                 rc = syscall(__NR_perf_event_open, args[i].attr, args[i].pid,
  80                         args[i].cpu, args[i].group_fd, args[i].flags);
  81                 printf("perf_event_open(%s, %d, %d, %d, %s) = %s\n",
  82                         printaddr(args[i].attr), args[i].pid, args[i].cpu,
  83                         args[i].group_fd, args[i].flags_str, sprintrc(rc));
  84         }
  85
  86         puts("+++ exited with 0 +++");
  87         return 0;
  88 }
  89
  90 #else
  91
  92 SKIP_MAIN_UNDEFINED("__NR_perf_event_open && HAVE_LINUX_PERF_EVENT_H");
  93
  94 #endif