gdb/nat/fork-inferior.h

   1 /* Functions and data responsible for forking the inferior process.
   2
   3    Copyright (C) 1986-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef FORK_INFERIOR_H
  21 #define FORK_INFERIOR_H
  22
  23 #include <string>
  24
  25 /* Number of traps that happen between exec'ing the shell to run an
  26    inferior and when we finally get to the inferior code, not counting
  27    the exec for the shell.  This is 1 on all supported
  28    implementations.  */
  29 #define START_INFERIOR_TRAPS_EXPECTED 1
  30
  31 /* Start an inferior Unix child process and sets inferior_ptid to its
  32    pid.  EXEC_FILE is the file to run.  ALLARGS is a string containing
  33    the arguments to the program.  ENV is the environment vector to
  34    pass.  SHELL_FILE is the shell file, or NULL if we should pick
  35    one.  EXEC_FUN is the exec(2) function to use, or NULL for the default
  36    one.  */
  37
  38 /* This function is NOT reentrant.  Some of the variables have been
  39    made static to ensure that they survive the vfork call.  */
  40 extern pid_t fork_inferior (const char *exec_file_arg,
  41                             const std::string &allargs,
  42                             char **env, void (*traceme_fun) (),
  43                             void (*init_trace_fun) (int),
  44                             void (*pre_trace_fun) (),
  45                             const char *shell_file_arg,
  46                             void (*exec_fun) (const char *file,
  47                                               char * const *argv,
  48                                               char * const *env));
  49
  50 /* Accept NTRAPS traps from the inferior.
  51
  52    Return the ptid of the inferior being started.  */
  53 extern ptid_t startup_inferior (pid_t pid, int ntraps,
  54                                 struct target_waitstatus *mystatus,
  55                                 ptid_t *myptid);
  56
  57 /* Whether to start up the debuggee under a shell.
  58
  59    If startup-with-shell is set, GDB's "run" will attempt to start up
  60    the debuggee under a shell.  This also happens when using GDBserver
  61    under extended remote mode.
  62
  63    This is in order for argument-expansion to occur.  E.g.,
  64
  65    (gdb) run *
  66
  67    The "*" gets expanded by the shell into a list of files.
  68
  69    While this is a nice feature, it may be handy to bypass the shell
  70    in some cases.  To disable this feature, do "set startup-with-shell
  71    false".
  72
  73    The catch-exec traps expected during start-up will be one more if
  74    the target is started up with a shell.  */
  75 extern int startup_with_shell;
  76
  77 /* Perform any necessary tasks before a fork/vfork takes place.  ARGS
  78    is a string containing all the arguments received by the inferior.
  79    This function is mainly used by fork_inferior.  */
  80 extern void prefork_hook (const char *args);
  81
  82 /* Perform any necessary tasks after a fork/vfork takes place.  This
  83    function is mainly used by fork_inferior.  */
  84 extern void postfork_hook (pid_t pid);
  85
  86 /* Perform any necessary tasks *on the child* after a fork/vfork takes
  87    place.  This function is mainly used by fork_inferior.  */
  88 extern void postfork_child_hook ();
  89
  90 /* Flush both stdout and stderr.  This function needs to be
  91    implemented differently on GDB and GDBserver.  */
  92 extern void gdb_flush_out_err ();
  93
  94 /* Report an error that happened when starting to trace the inferior
  95    (i.e., when the "traceme_fun" callback is called on fork_inferior)
  96    and bail out.  This function does not return.  */
  97 extern void trace_start_error (const char *fmt, ...)
  98   ATTRIBUTE_NORETURN;
  99
 100 /* Like "trace_start_error", but the error message is constructed by
 101    combining STRING with the system error message for errno.  This
 102    function does not return.  */
 103 extern void trace_start_error_with_name (const char *string)
 104   ATTRIBUTE_NORETURN;
 105
 106 #endif /* ! FORK_INFERIOR_H */