/* Fork a Unix child process, and set up to debug it, for GDB. Copyright 1990, 1991, 1992 Free Software Foundation, Inc. Contributed by Cygnus Support. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "frame.h" /* required by inferior.h */ #include "inferior.h" #include "target.h" #include "wait.h" #include "gdbcore.h" #include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */ #include #ifdef SET_STACK_LIMIT_HUGE #include #include extern int original_stack_limit; #endif /* SET_STACK_LIMIT_HUGE */ extern char **environ; /* Start an inferior Unix child process and sets inferior_pid to its pid. EXEC_FILE is the file to run. ALLARGS is a string containing the arguments to the program. ENV is the environment vector to pass. Errors reported with error(). */ #ifndef SHELL_FILE #define SHELL_FILE "/bin/sh" #endif void fork_inferior (exec_file, allargs, env, traceme_fun, init_trace_fun) char *exec_file; char *allargs; char **env; void (*traceme_fun) PARAMS ((void)); void (*init_trace_fun) PARAMS ((int)); { int pid; char *shell_command; char *shell_file; static char default_shell_file[] = SHELL_FILE; int len; int pending_execs; /* Set debug_fork then attach to the child while it sleeps, to debug. */ static int debug_fork = 0; /* This is set to the result of setpgrp, which if vforked, will be visible to you in the parent process. It's only used by humans for debugging. */ static int debug_setpgrp = 657473; char **save_our_env; /* If no exec file handed to us, get it from the exec-file command -- with a good, common error message if none is specified. */ if (exec_file == 0) exec_file = get_exec_file(1); /* The user might want tilde-expansion, and in general probably wants the program to behave the same way as if run from his/her favorite shell. So we let the shell run it for us. FIXME, this should probably search the local environment (as modified by the setenv command), not the env gdb inherited. */ shell_file = getenv ("SHELL"); if (shell_file == NULL) shell_file = default_shell_file; /* Multiplying the length of exec_file by 4 is to account for the fact that it may expand when quoted; it is a worst-case number based on every character being '. */ len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 12; /* If desired, concat something onto the front of ALLARGS. SHELL_COMMAND is the result. */ #ifdef SHELL_COMMAND_CONCAT shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len); strcpy (shell_command, SHELL_COMMAND_CONCAT); #else shell_command = (char *) alloca (len); shell_command[0] = '\0'; #endif strcat (shell_command, "exec "); /* Now add exec_file, quoting as necessary. Quoting in this style is said to work with all shells. */ { char *p; strcat (shell_command, "'"); for (p = exec_file; *p != '\0'; ++p) { if (*p == '\'') strcat (shell_command, "'\\''"); else strncat (shell_command, p, 1); } strcat (shell_command, "'"); } strcat (shell_command, " "); strcat (shell_command, allargs); /* exec is said to fail if the executable is open. */ close_exec_file (); /* Retain a copy of our environment variables, since the child will replace the value of environ and if we're vforked, we have to restore it. */ save_our_env = environ; /* Tell the terminal handling subsystem what tty we plan to run on; it will just record the information for later. */ new_tty_prefork (inferior_io_terminal); /* It is generally good practice to flush any possible pending stdio output prior to doing a fork, to avoid the possibility of both the parent and child flushing the same data after the fork. */ fflush (stdout); fflush (stderr); #if defined(USG) && !defined(HAVE_VFORK) pid = fork (); #else if (debug_fork) pid = fork (); else pid = vfork (); #endif if (pid < 0) perror_with_name ("vfork"); if (pid == 0) { if (debug_fork) sleep (debug_fork); #ifdef TIOCGPGRP /* Run inferior in a separate process group. */ #ifdef NEED_POSIX_SETPGID debug_setpgrp = setpgid (0, 0); #else #if defined(USG) && !defined(SETPGRP_ARGS) debug_setpgrp = setpgrp (); #else debug_setpgrp = setpgrp (getpid (), getpid ()); #endif /* USG */ #endif /* NEED_POSIX_SETPGID */ if (debug_setpgrp == -1) perror("setpgrp failed in child"); #endif /* TIOCGPGRP */ #ifdef SET_STACK_LIMIT_HUGE /* Reset the stack limit back to what it was. */ { struct rlimit rlim; getrlimit (RLIMIT_STACK, &rlim); rlim.rlim_cur = original_stack_limit; setrlimit (RLIMIT_STACK, &rlim); } #endif /* SET_STACK_LIMIT_HUGE */ /* Ask the tty subsystem to switch to the one we specified earlier (or to share the current terminal, if none was specified). */ new_tty (); /* Changing the signal handlers for the inferior after a vfork can also change them for the superior, so we don't mess with signals here. See comments in initialize_signals for how we get the right signal handlers for the inferior. */ /* "Trace me, Dr. Memory!" */ (*traceme_fun) (); /* There is no execlpe call, so we have to set the environment for our child in the global variable. If we've vforked, this clobbers the parent, but environ is restored a few lines down in the parent. By the way, yes we do need to look down the path to find $SHELL. Rich Pixley says so, and I agree. */ environ = env; execlp (shell_file, shell_file, "-c", shell_command, (char *)0); fprintf (stderr, "Cannot exec %s: %s.\n", shell_file, safe_strerror (errno)); fflush (stderr); _exit (0177); } /* Restore our environment in case a vforked child clob'd it. */ environ = save_our_env; /* Now that we have a child process, make it our target, and initialize anything target-vector-specific that needs initializing. */ (*init_trace_fun)(pid); #ifdef CREATE_INFERIOR_HOOK CREATE_INFERIOR_HOOK (pid); #endif /* The process was started by the fork that created it, but it will have stopped one instruction after execing the shell. Here we must get it up to actual execution of the real program. */ inferior_pid = pid; /* Needed for wait_for_inferior stuff below */ clear_proceed_status (); /* We will get a trace trap after one instruction. Continue it automatically. Eventually (after shell does an exec) it will get another trace trap. Then insert breakpoints and continue. */ #ifdef START_INFERIOR_TRAPS_EXPECTED pending_execs = START_INFERIOR_TRAPS_EXPECTED; #else pending_execs = 2; #endif init_wait_for_inferior (); /* Set up the "saved terminal modes" of the inferior based on what modes we are starting it with. */ target_terminal_init (); /* Install inferior's terminal modes. */ target_terminal_inferior (); while (1) { stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */ wait_for_inferior (); if (stop_signal != SIGTRAP) { /* Let shell child handle its own signals in its own way */ /* FIXME, what if child has exit()ed? Must exit loop somehow */ resume (0, stop_signal); } else { /* We handle SIGTRAP, however; it means child did an exec. */ if (0 == --pending_execs) break; resume (0, 0); /* Just make it go on */ } } stop_soon_quietly = 0; /* We are now in the child process of interest, having exec'd the correct program, and are poised at the first instruction of the new program. */ #ifdef SOLIB_CREATE_INFERIOR_HOOK SOLIB_CREATE_INFERIOR_HOOK (pid); #endif }