tools/perf/util/util.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_UTIL_H
   3 #define __PERF_UTIL_H
   4
   5 #define _BSD_SOURCE 1
   6 /* glibc 2.20 deprecates _BSD_SOURCE in favour of _DEFAULT_SOURCE */
   7 #define _DEFAULT_SOURCE 1
   8
   9 #include <dirent.h>
  10 #include <fcntl.h>
  11 #include <stdbool.h>
  12 #include <stddef.h>
  13 #include <linux/compiler.h>
  14 #include <sys/types.h>
  15 #ifndef __cplusplus
  16 #include <internal/cpumap.h>
  17 #endif
  18
  19 extern const char perf_usage_string[];
  20 extern const char perf_more_info_string[];
  21
  22 extern const char *input_name;
  23
  24 /* This will control if perf_{host,guest} will set attr.exclude_{host,guest}. */
  25 extern bool exclude_GH_default;
  26
  27 extern bool perf_host;
  28 extern bool perf_guest;
  29
  30 /* General helper functions */
  31 void usage(const char *err) __noreturn;
  32 void die(const char *err, ...) __noreturn __printf(1, 2);
  33
  34 struct dirent;
  35 struct strlist;
  36
  37 int mkdir_p(char *path, mode_t mode);
  38 int rm_rf(const char *path);
  39 int rm_rf_perf_data(const char *path);
  40 struct strlist *lsdir(const char *name, bool (*filter)(const char *, struct dirent *));
  41 bool lsdir_no_dot_filter(const char *name, struct dirent *d);
  42
  43 size_t hex_width(u64 v);
  44
  45 int sysctl__max_stack(void);
  46
  47 bool sysctl__nmi_watchdog_enabled(void);
  48
  49 int perf_tip(char **strp, const char *dirpath);
  50
  51 #ifndef HAVE_SCHED_GETCPU_SUPPORT
  52 int sched_getcpu(void);
  53 #endif
  54
  55 #ifndef HAVE_SCANDIRAT_SUPPORT
  56 int scandirat(int dirfd, const char *dirp,
  57               struct dirent ***namelist,
  58               int (*filter)(const struct dirent *),
  59               int (*compar)(const struct dirent **, const struct dirent **));
  60 #endif
  61
  62 extern bool perf_singlethreaded;
  63
  64 void perf_set_singlethreaded(void);
  65 void perf_set_multithreaded(void);
  66
  67 char *perf_exe(char *buf, int len);
  68
  69 #ifndef O_CLOEXEC
  70 #ifdef __sparc__
  71 #define O_CLOEXEC      0x400000
  72 #elif defined(__alpha__) || defined(__hppa__)
  73 #define O_CLOEXEC      010000000
  74 #else
  75 #define O_CLOEXEC      02000000
  76 #endif
  77 #endif
  78
  79 struct perf_debuginfod {
  80         const char      *urls;
  81         bool             set;
  82 };
  83 void perf_debuginfod_setup(struct perf_debuginfod *di);
  84
  85 char *filename_with_chroot(int pid, const char *filename);
  86
  87 int do_realloc_array_as_needed(void **arr, size_t *arr_sz, size_t x,
  88                                size_t msz, const void *init_val);
  89
  90 #define realloc_array_as_needed(a, n, x, v) ({                  \
  91         typeof(x) __x = (x);                                    \
  92         __x >= (n) ?                                            \
  93                 do_realloc_array_as_needed((void **)&(a),       \
  94                                            &(n),                \
  95                                            __x,                 \
  96                                            sizeof(*(a)),        \
  97                                            (const void *)(v)) : \
  98                 0;                                              \
  99         })
 100
 101 static inline bool host_is_bigendian(void)
 102 {
 103 #ifdef __BYTE_ORDER__
 104 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 105         return false;
 106 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 107         return true;
 108 #else
 109 #error "Unrecognized __BYTE_ORDER__"
 110 #endif
 111 #else /* !__BYTE_ORDER__ */
 112         unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
 113         unsigned int *ptr;
 114
 115         ptr = (unsigned int *)(void *)str;
 116         return *ptr == 0x01020304;
 117 #endif
 118 }
 119
 120 #endif /* __PERF_UTIL_H */