src/basic/util.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   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 bool kexec_loaded(void);
  17
  18 int prot_from_flags(int flags) _const_;
  19
  20 bool in_initrd(void);
  21 void in_initrd_force(bool value);
  22
  23 int on_ac_power(void);
  24
  25 static inline unsigned u64log2(uint64_t n) {
  26 #if __SIZEOF_LONG_LONG__ == 8
  27         return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
  28 #else
  29 #error "Wut?"
  30 #endif
  31 }
  32
  33 static inline unsigned u32ctz(uint32_t n) {
  34 #if __SIZEOF_INT__ == 4
  35         return n != 0 ? __builtin_ctz(n) : 32;
  36 #else
  37 #error "Wut?"
  38 #endif
  39 }
  40
  41 static inline unsigned log2i(int x) {
  42         assert(x > 0);
  43
  44         return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1;
  45 }
  46
  47 static inline unsigned log2u(unsigned x) {
  48         assert(x > 0);
  49
  50         return sizeof(unsigned) * 8 - __builtin_clz(x) - 1;
  51 }
  52
  53 static inline unsigned log2u_round_up(unsigned x) {
  54         assert(x > 0);
  55
  56         if (x == 1)
  57                 return 0;
  58
  59         return log2u(x - 1) + 1;
  60 }
  61
  62 int container_get_leader(const char *machine, pid_t *pid);
  63
  64 int version(void);
  65
  66 int str_verscmp(const char *s1, const char *s2);
  67
  68 void disable_coredumps(void);