tools/perf/util/syscalltbl.c

   1 /*
   2  * System call table mapper
   3  *
   4  * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #include "syscalltbl.h"
  17 #include <stdlib.h>
  18
  19 #ifdef HAVE_SYSCALL_TABLE
  20 #include <linux/compiler.h>
  21 #include <string.h>
  22 #include "util.h"
  23
  24 struct syscall {
  25         int id;
  26         const char *name;
  27 };
  28
  29 static int syscallcmpname(const void *vkey, const void *ventry)
  30 {
  31         const char *key = vkey;
  32         const struct syscall *entry = ventry;
  33
  34         return strcmp(key, entry->name);
  35 }
  36
  37 static int syscallcmp(const void *va, const void *vb)
  38 {
  39         const struct syscall *a = va, *b = vb;
  40
  41         return strcmp(a->name, b->name);
  42 }
  43
  44 static int syscalltbl__init_native(struct syscalltbl *tbl)
  45 {
  46         int nr_entries = 0, i, j;
  47         struct syscall *entries;
  48
  49         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  50                 if (syscalltbl_native[i])
  51                         ++nr_entries;
  52
  53         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  54         if (tbl->syscalls.entries == NULL)
  55                 return -1;
  56
  57         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  58                 if (syscalltbl_native[i]) {
  59                         entries[j].name = syscalltbl_native[i];
  60                         entries[j].id = i;
  61                         ++j;
  62                 }
  63         }
  64
  65         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  66         tbl->syscalls.nr_entries = nr_entries;
  67         return 0;
  68 }
  69
  70 struct syscalltbl *syscalltbl__new(void)
  71 {
  72         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  73         if (tbl) {
  74                 if (syscalltbl__init_native(tbl)) {
  75                         free(tbl);
  76                         return NULL;
  77                 }
  78         }
  79         return tbl;
  80 }
  81
  82 void syscalltbl__delete(struct syscalltbl *tbl)
  83 {
  84         zfree(&tbl->syscalls.entries);
  85         free(tbl);
  86 }
  87
  88 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
  89 {
  90         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
  91 }
  92
  93 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
  94 {
  95         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
  96                                      tbl->syscalls.nr_entries, sizeof(*sc),
  97                                      syscallcmpname);
  98
  99         return sc ? sc->id : -1;
 100 }
 101
 102 #else /* HAVE_SYSCALL_TABLE */
 103
 104 #include <libaudit.h>
 105
 106 struct syscalltbl *syscalltbl__new(void)
 107 {
 108         struct syscalltbl *tbl = malloc(sizeof(*tbl));
 109         if (tbl)
 110                 tbl->audit_machine = audit_detect_machine();
 111         return tbl;
 112 }
 113
 114 void syscalltbl__delete(struct syscalltbl *tbl)
 115 {
 116         free(tbl);
 117 }
 118
 119 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 120 {
 121         return audit_syscall_to_name(id, tbl->audit_machine);
 122 }
 123
 124 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 125 {
 126         return audit_name_to_syscall(name, tbl->audit_machine);
 127 }
 128 #endif /* HAVE_SYSCALL_TABLE */