src/bin/lttng-sessiond/lttng-syscall.hpp

   1 /*
   2  * Copyright (C) 2014 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef LTTNG_SYSCALL_H
   9 #define LTTNG_SYSCALL_H
  10
  11 #include "trace-kernel.hpp"
  12
  13 #include <common/exception.hpp>
  14 #include <common/hashtable/hashtable.hpp>
  15 #include <common/macros.hpp>
  16 #include <common/string-utils/c-string-view.hpp>
  17
  18 #include <lttng/event.h>
  19
  20 /*
  21  * Default size of the kernel system call array. With this size, we usually
  22  * reallocate twice considering a 32 bit compat layer also.
  23  */
  24 #define SYSCALL_TABLE_INIT_SIZE 256
  25
  26 /* Maximum length of a syscall name. */
  27 #define SYSCALL_NAME_LEN 255
  28
  29 /*
  30  * Represent a kernel syscall and used when we are populating the internal
  31  * list.
  32  */
  33 struct syscall {
  34         syscall(std::uint32_t index_, std::uint32_t bitness_, const lttng::c_string_view name_) :
  35                 index(index_), bitness(bitness_)
  36         {
  37                 if (lttng_strncpy(name, name_.data(), sizeof(name))) {
  38                         LTTNG_THROW_INVALID_ARGUMENT_ERROR(fmt::format(
  39                                 "Invalid syscall name: name=`{}`, length={}, max_length={}",
  40                                 name_.data(),
  41                                 name_.len(),
  42                                 sizeof(name)));
  43                 }
  44
  45                 lttng_ht_node_init_str(&node, name);
  46         }
  47
  48         std::uint32_t index = 0;
  49         std::uint32_t bitness = 0;
  50         char name[SYSCALL_NAME_LEN] = {};
  51         /* Used by the list syscalls command. */
  52         struct lttng_ht_node_str node = {};
  53 };
  54
  55 /*
  56  * Allocated once when listing all syscalls at boot time. This is an array
  57  * indexed by the syscall index provided in the listing.
  58  */
  59 extern std::vector<struct syscall> syscall_table;
  60
  61 /* Use to list kernel system calls. */
  62 int syscall_init_table(int tracer_fd);
  63 ssize_t syscall_table_list(struct lttng_event **events);
  64
  65 #endif /* LTTNG_SYSCALL_H */