src/basic/util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <stdint.h>
   5
   6 #include "macro.h"
   7
   8 extern int saved_argc;
   9 extern char **saved_argv;
  10
  11 static inline void save_argc_argv(int argc, char **argv) {
  12         saved_argc = argc;
  13         saved_argv = argv;
  14 }
  15
  16 extern char **saved_env;
  17 void save_env(void);
  18
  19 bool kexec_loaded(void);
  20
  21 int prot_from_flags(int flags) _const_;
  22
  23 bool in_initrd(void);
  24 void in_initrd_force(bool value);
  25
  26 int on_ac_power(void);
  27
  28 static inline unsigned u64log2(uint64_t n) {
  29 #if __SIZEOF_LONG_LONG__ == 8
  30         return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
  31 #else
  32 #error "Wut?"
  33 #endif
  34 }
  35
  36 static inline unsigned u32ctz(uint32_t n) {
  37 #if __SIZEOF_INT__ == 4
  38         return n != 0 ? __builtin_ctz(n) : 32;
  39 #else
  40 #error "Wut?"
  41 #endif
  42 }
  43
  44 static inline unsigned log2i(int x) {
  45         assert(x > 0);
  46
  47         return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1;
  48 }
  49
  50 static inline unsigned log2u(unsigned x) {
  51         assert(x > 0);
  52
  53         return sizeof(unsigned) * 8 - __builtin_clz(x) - 1;
  54 }
  55
  56 static inline unsigned log2u_round_up(unsigned x) {
  57         assert(x > 0);
  58
  59         if (x == 1)
  60                 return 0;
  61
  62         return log2u(x - 1) + 1;
  63 }
  64
  65 int container_get_leader(const char *machine, pid_t *pid);
  66
  67 int version(void);
  68
  69 int str_verscmp(const char *s1, const char *s2);
  70
  71 void disable_coredumps(void);