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Diffstat (limited to 'gdb/infrun.c')
| -rw-r--r-- | gdb/infrun.c | 943 |
1 files changed, 943 insertions, 0 deletions
diff --git a/gdb/infrun.c b/gdb/infrun.c new file mode 100644 index 0000000..e980cec --- /dev/null +++ b/gdb/infrun.c @@ -0,0 +1,943 @@ +/* Start and stop the inferior process, for GDB. + Copyright (C) 1986, 1987 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +#include "defs.h" +#include "initialize.h" +#include "param.h" +#include "symtab.h" +#include "frame.h" +#include "inferior.h" +#include "wait.h" + +#include <stdio.h> +#include <signal.h> +#include <a.out.h> + +#ifdef UMAX_PTRACE +#include <sys/param.h> +#include <sys/ptrace.h> +#endif UMAX_PTRACE + +extern char *sys_siglist[]; +extern int errno; + +/* Tables of how to react to signals; the user sets them. */ + +static char signal_stop[NSIG]; +static char signal_print[NSIG]; +static char signal_program[NSIG]; + +/* Nonzero if breakpoints are now inserted in the inferior. */ + +static int breakpoints_inserted; + +/* Function inferior was in as of last step command. */ + +static struct symbol *step_start_function; + +/* This is the sequence of bytes we insert for a breakpoint. */ + +static char break_insn[] = BREAKPOINT; + +/* Nonzero => address for special breakpoint for resuming stepping. */ + +static CORE_ADDR step_resume_break_address; + +/* Original contents of the byte where the special breakpoint is. */ + +static char step_resume_break_shadow[sizeof break_insn]; + +/* Nonzero means the special breakpoint is a duplicate + so it has not itself been inserted. */ + +static int step_resume_break_duplicate; + +/* Nonzero if we are expecting a trace trap and should proceed from it. + 2 means expecting 2 trace traps and should continue both times. + That occurs when we tell sh to exec the program: we will get + a trap after the exec of sh and a second when the program is exec'd. */ + +static int trap_expected; + +/* Nonzero means expecting a trace trap + and should stop the inferior and return silently when it happens. */ + +static int stop_after_trap; + +/* Nonzero means expecting a trace trap due to attaching to a process. */ + +static int stop_after_attach; + +/* Nonzero if pc has been changed by the debugger + since the inferior stopped. */ + +int pc_changed; + +/* Save register contents here when about to pop a stack dummy frame. */ + +char stop_registers[REGISTER_BYTES]; + +/* Nonzero if program stopped due to error trying to insert breakpoints. */ + +static int breakpoints_failed; + +/* Nonzero if inferior is in sh before our program got exec'd. */ + +static int running_in_shell; + +/* Nonzero after stop if current stack frame should be printed. */ + +static int stop_print_frame; + +static void insert_step_breakpoint (); +static void remove_step_breakpoint (); +static void wait_for_inferior (); +static void normal_stop (); + +START_FILE + +/* Clear out all variables saying what to do when inferior is continued. + First do this, then set the ones you want, then call `proceed'. */ + +void +clear_proceed_status () +{ + trap_expected = 0; + step_range_start = 0; + step_range_end = 0; + step_frame = 0; + step_over_calls = -1; + step_resume_break_address = 0; + stop_after_trap = 0; + stop_after_attach = 0; + + /* Discard any remaining commands left by breakpoint we had stopped at. */ + clear_breakpoint_commands (); +} + +/* Basic routine for continuing the program in various fashions. + + ADDR is the address to resume at, or -1 for resume where stopped. + SIGNAL is the signal to give it, or 0 for none, + or -1 for act according to how it stopped. + STEP is nonzero if should trap after one instruction. + -1 means return after that and print nothing. + You should probably set various step_... variables + before calling here, if you are stepping. + + You should call clear_proceed_status before calling proceed. */ + +void +proceed (addr, signal, step) + CORE_ADDR addr; + int signal; + int step; +{ + int oneproc = 0; + + if (step > 0) + step_start_function = find_pc_function (read_pc ()); + if (step < 0) + stop_after_trap = 1; + + if (addr == -1) + { + /* If there is a breakpoint at the address we will resume at, + step one instruction before inserting breakpoints + so that we do not stop right away. */ + + if (!pc_changed && breakpoint_here_p (read_pc ())) + { + oneproc = 1; + /* We will get a trace trap after one instruction. + Continue it automatically and insert breakpoints then. */ + trap_expected = 1; + } + } + else + write_register (PC_REGNUM, addr); + + if (!oneproc) + { + int temp = insert_breakpoints (); + if (temp) + { + print_sys_errmsg ("ptrace", temp); + error ("Cannot insert breakpoints.\n\ +The same program may be running in another process."); + } + breakpoints_inserted = 1; + } + + /* Install inferior's terminal modes. */ + terminal_inferior (); + + if (signal >= 0) + stop_signal = signal; + /* If this signal should not be seen by program, + give it zero. Used for debugging signals. */ + else if (stop_signal < NSIG && !signal_program[stop_signal]) + stop_signal= 0; + + /* Resume inferior. */ + resume (oneproc || step, stop_signal); + + /* Wait for it to stop (if not standalone) + and in any case decode why it stopped, and act accordingly. */ + + wait_for_inferior (); + normal_stop (); +} + +/* Writing the inferior pc as a register calls this function + to inform infrun that the pc has been set in the debugger. */ + +writing_pc (val) + CORE_ADDR val; +{ + stop_pc = val; + pc_changed = 1; +} + +/* Start an inferior process for the first time. + Actually it was started by the fork that created it, + but it will have stopped one instruction after execing sh. + Here we must get it up to actual execution of the real program. */ + +start_inferior () +{ + /* 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. */ + trap_expected = 2; + running_in_shell = 0; /* Set to 1 at first SIGTRAP, 0 at second. */ + breakpoints_inserted = 0; + mark_breakpoints_out (); + + /* Set up the "saved terminal modes" of the inferior + based on what modes we are starting it with. */ + terminal_init_inferior (); + + /* Install inferior's terminal modes. */ + terminal_inferior (); + + wait_for_inferior (); + normal_stop (); +} + +#ifdef ATTACH_DETACH + +/* Attach to process PID, then initialize for debugging it + and wait for the trace-trap that results from attaching. */ + +void +attach_program (pid) + int pid; +{ + attach (pid); + inferior_pid = pid; + + mark_breakpoints_out (); + terminal_init_inferior (); + clear_proceed_status (); + stop_after_attach = 1; + /*proceed (-1, 0, -2);*/ + wait_for_inferior (); + normal_stop (); +} +#endif /* ATTACH_DETACH */ + +/* Wait for control to return from inferior to debugger. + If inferior gets a signal, we may decide to start it up again + instead of returning. That is why there is a loop in this function. + When this function actually returns it means the inferior + should be left stopped and GDB should read more commands. */ + +static void +wait_for_inferior () +{ + register int pid; + WAITTYPE w; + CORE_ADDR pc; + int tem; + int another_trap; + int random_signal; + CORE_ADDR stop_sp; + int stop_step_resume_break; + int newmisc; + int newfun_pc; + struct symbol *newfun; + struct symtab_and_line sal; + int prev_pc; + + while (1) + { + prev_pc = read_pc (); + pid = wait (&w); + pc_changed = 0; + fetch_inferior_registers (); + stop_pc = read_pc (); + set_current_frame (read_register (FP_REGNUM)); + stop_frame = get_current_frame (); + stop_sp = read_register (SP_REGNUM); + another_trap = 0; + stop_breakpoint = 0; + stop_step = 0; + stop_stack_dummy = 0; + stop_print_frame = 1; + stop_step_resume_break = 0; + random_signal = 0; + breakpoints_failed = 0; + + /* Look at the cause of the stop, and decide what to do. + The alternatives are: + 1) break; to really stop and return to the debugger, + 2) drop through to start up again + (set another_trap to 1 to single step once) + 3) set random_signal to 1, and the decision between 1 and 2 + will be made according to the signal handling tables. */ + + if (WIFEXITED (w)) + { + terminal_ours_for_output (); + if (WRETCODE (w)) + printf ("\nProgram exited with code 0%o.\n", WRETCODE (w)); + else + printf ("\nProgram exited normally.\n"); + fflush (stdout); + inferior_died (); + stop_print_frame = 0; + break; + } + else if (!WIFSTOPPED (w)) + { + kill_inferior (); + stop_print_frame = 0; + stop_signal = WTERMSIG (w); + terminal_ours_for_output (); + printf ("\nProgram terminated with signal %d, %s\n", + stop_signal, + stop_signal < NSIG + ? sys_siglist[stop_signal] + : "(undocumented)"); + printf ("The inferior process no longer exists.\n"); + fflush (stdout); + break; + } + else + { + stop_signal = WSTOPSIG (w); + + /* First, distinguish signals caused by the debugger from signals + that have to do with the program's own actions. + Note that breakpoint insns may cause SIGTRAP or SIGILL + or SIGEMT, depending on the operating system version. + Here we detect when a SIGILL or SIGEMT is really a breakpoint + and change it to SIGTRAP. */ + + if (stop_signal == SIGTRAP + || (breakpoints_inserted && + (stop_signal == SIGILL + || stop_signal == SIGEMT)) + || stop_after_attach) + { + if (stop_signal == SIGTRAP && stop_after_trap) + { + stop_print_frame = 0; + break; + } + if (stop_after_attach) + break; + /* Don't even think about breakpoints + if still running the shell that will exec the program + or if just proceeded over a breakpoint. */ + if (stop_signal == SIGTRAP && trap_expected) + stop_breakpoint = 0; + else + /* See if there is a breakpoint at the current PC. */ +#if DECR_PC_AFTER_BREAK + /* Notice the case of stepping through a jump + that leads just after a breakpoint. + Don't confuse that with hitting the breakpoint. + What we check for is that 1) stepping is going on + and 2) the pc before the last insn does not match + the address of the breakpoint before the current pc. */ + if (!(prev_pc != stop_pc - DECR_PC_AFTER_BREAK + && step_range_end && !step_resume_break_address)) +#endif /* DECR_PC_AFTER_BREAK not zero */ + { + select_frame (stop_frame, 0); /* For condition exprs. */ + stop_breakpoint = breakpoint_stop_status (stop_pc, stop_frame); + /* Following in case break condition called a function. */ + stop_print_frame = 1; + if (stop_breakpoint && DECR_PC_AFTER_BREAK) + { + stop_pc -= DECR_PC_AFTER_BREAK; + write_register (PC_REGNUM, stop_pc); + pc_changed = 0; + } + } + /* See if we stopped at the special breakpoint for + stepping over a subroutine call. */ + if (stop_pc - DECR_PC_AFTER_BREAK == step_resume_break_address) + { + stop_step_resume_break = 1; + if (DECR_PC_AFTER_BREAK) + { + stop_pc -= DECR_PC_AFTER_BREAK; + write_register (PC_REGNUM, stop_pc); + pc_changed = 0; + } + } + + if (stop_signal == SIGTRAP) + random_signal + = !(stop_breakpoint || trap_expected + || stop_step_resume_break + || (stop_sp INNER_THAN stop_pc && stop_pc INNER_THAN stop_frame) + || (step_range_end && !step_resume_break_address)); + else + { + random_signal + = !(stop_breakpoint || stop_step_resume_break); + if (!random_signal) + stop_signal = SIGTRAP; + } + } + else + random_signal = 1; + + /* For the program's own signals, act according to + the signal handling tables. */ + + if (random_signal + && !(running_in_shell && stop_signal == SIGSEGV)) + { + /* Signal not for debugging purposes. */ + int printed = 0; + + if (stop_signal >= NSIG + || signal_print[stop_signal]) + { + printed = 1; + terminal_ours_for_output (); + printf ("\nProgram received signal %d, %s\n", + stop_signal, + stop_signal < NSIG + ? sys_siglist[stop_signal] + : "(undocumented)"); + fflush (stdout); + } + if (stop_signal >= NSIG + || signal_stop[stop_signal]) + break; + /* If not going to stop, give terminal back + if we took it away. */ + else if (printed) + terminal_inferior (); + } + + /* Handle cases caused by hitting a breakpoint. */ + + if (!random_signal + && (stop_breakpoint || stop_step_resume_break)) + { + /* Does a breakpoint want us to stop? */ + if (stop_breakpoint && stop_breakpoint != -1) + { + /* 0x1000000 is set in stop_breakpoint as returned by + breakpoint_status_p to indicate a silent breakpoint. */ + if (stop_breakpoint > 0 && stop_breakpoint & 0x1000000) + { + stop_breakpoint &= ~0x1000000; + stop_print_frame = 0; + } + break; + } + /* But if we have hit the step-resumption breakpoint, + remove it. It has done its job getting us here. */ + if (stop_step_resume_break + && (step_frame == 0 || stop_frame == step_frame)) + { + remove_step_breakpoint (); + step_resume_break_address = 0; + } + /* Otherwise, must remove breakpoints and single-step + to get us past the one we hit. */ + else + { + remove_breakpoints (); + remove_step_breakpoint (); + breakpoints_inserted = 0; + another_trap = 1; + } + + /* We come here if we hit a breakpoint but should not + stop for it. Possibly we also were stepping + and should stop for that. So fall through and + test for stepping. But, if not stepping, + do not stop. */ + } + + /* If this is the breakpoint at the end of a stack dummy, + just stop silently. */ + if (stop_sp INNER_THAN stop_pc && stop_pc INNER_THAN stop_frame) + { + stop_print_frame = 0; + stop_stack_dummy = 1; + break; + } + + if (step_resume_break_address) + /* Having a step-resume breakpoint overrides anything + else having to do with stepping commands until + that breakpoint is reached. */ + ; + /* If stepping through a line, keep going if still within it. */ + else if (!random_signal + && step_range_end + && stop_pc >= step_range_start + && stop_pc < step_range_end) + { + /* Don't step through the return from a function + unless that is the first instruction stepped through. */ + if (ABOUT_TO_RETURN (stop_pc)) + { + stop_step = 1; + break; + } + } + + /* We stepped out of the stepping range. See if that was due + to a subroutine call that we should proceed to the end of. */ + else if (!random_signal && step_range_end) + { + newfun = find_pc_function (stop_pc); + if (newfun) + { + newfun_pc = BLOCK_START (SYMBOL_BLOCK_VALUE (newfun)) + + FUNCTION_START_OFFSET; + } + else + { + newmisc = find_pc_misc_function (stop_pc); + if (newmisc >= 0) + newfun_pc = misc_function_vector[newmisc].address + + FUNCTION_START_OFFSET; + else newfun_pc = 0; + } + if (stop_pc == newfun_pc + && (step_over_calls > 0 || (step_over_calls && newfun == 0))) + { + /* A subroutine call has happened. */ + /* Set a special breakpoint after the return */ + step_resume_break_address = SAVED_PC_AFTER_CALL (stop_frame); + step_resume_break_duplicate + = breakpoint_here_p (step_resume_break_address); + if (breakpoints_inserted) + insert_step_breakpoint (); + } + /* Subroutine call with source code we should not step over. + Do step to the first line of code in it. */ + else if (stop_pc == newfun_pc && step_over_calls) + { + SKIP_PROLOGUE (newfun_pc); + sal = find_pc_line (newfun_pc, 0); + /* Use the step_resume_break to step until + the end of the prologue, even if that involves jumps + (as it seems to on the vax under 4.2). */ + /* If the prologue ends in the middle of a source line, + continue to the end of that source line. + Otherwise, just go to end of prologue. */ + if (sal.end && sal.pc != newfun_pc) + step_resume_break_address = sal.end; + else + step_resume_break_address = newfun_pc; + + step_resume_break_duplicate + = breakpoint_here_p (step_resume_break_address); + if (breakpoints_inserted) + insert_step_breakpoint (); + /* Do not specify what the fp should be when we stop + since on some machines the prologue + is where the new fp value is established. */ + step_frame = 0; + /* And make sure stepping stops right away then. */ + step_range_end = step_range_start; + } + /* No subroutince call; stop now. */ + else + { + stop_step = 1; + break; + } + } + } + + /* If we did not do break;, it means we should keep + running the inferior and not return to debugger. */ + + /* If trap_expected is 2, it means continue once more + and insert breakpoints at the next trap. + If trap_expected is 1 and the signal was SIGSEGV, it means + the shell is doing some memory allocation--just resume it + with SIGSEGV. + Otherwise insert breakpoints now, and possibly single step. */ + + if (trap_expected > 1) + { + trap_expected--; + running_in_shell = 1; + resume (0, 0); + } + else if (running_in_shell && stop_signal == SIGSEGV) + { + resume (0, SIGSEGV); + } + else + { + /* Here, we are not awaiting another exec to get + the program we really want to debug. + Insert breakpoints now, unless we are trying + to one-proceed past a breakpoint. */ + running_in_shell = 0; + if (!breakpoints_inserted && !another_trap) + { + insert_step_breakpoint (); + breakpoints_failed = insert_breakpoints (); + if (breakpoints_failed) + break; + breakpoints_inserted = 1; + } + + trap_expected = another_trap; + + if (stop_signal == SIGTRAP) + stop_signal = 0; + + resume ((step_range_end && !step_resume_break_address) + || trap_expected, + stop_signal); + } + } +} + +/* Here to return control to GDB when the inferior stops for real. + Print appropriate messages, remove breakpoints, give terminal our modes. + + RUNNING_IN_SHELL nonzero means the shell got a signal before + exec'ing the program we wanted to run. + STOP_PRINT_FRAME nonzero means print the executing frame + (pc, function, args, file, line number and line text). + BREAKPOINTS_FAILED nonzero means stop was due to error + attempting to insert breakpoints. */ + +static void +normal_stop () +{ + if (breakpoints_failed) + { + terminal_ours_for_output (); + print_sys_errmsg ("ptrace", breakpoints_failed); + printf ("Stopped; cannot insert breakpoints.\n\ +The same program may be running in another process.\n"); + } + + if (inferior_pid) + remove_step_breakpoint (); + + if (inferior_pid && breakpoints_inserted) + if (remove_breakpoints ()) + { + terminal_ours_for_output (); + printf ("Cannot remove breakpoints because program is no longer writable.\n\ +It must be running in another process.\n\ +Further execution is probably impossible.\n"); + } + + breakpoints_inserted = 0; + + /* Delete the breakpoint we stopped at, if it wants to be deleted. + Delete any breakpoint that is to be deleted at the next stop. */ + + breakpoint_auto_delete (stop_breakpoint); + + if (step_multi && stop_step) + return; + + terminal_ours (); + + if (running_in_shell) + { + if (stop_signal == SIGSEGV) + printf ("\ +You have just encountered a bug in \"sh\". GDB starts your program\n\ +by running \"sh\" with a command to exec your program.\n\ +This is so that \"sh\" will process wildcards and I/O redirection.\n\ +This time, \"sh\" crashed.\n\ +\n\ +One known bug in \"sh\" bites when the environment takes up a lot of space.\n\ +Try \"info env\" to see the environment; then use \"unset-env\" to kill\n\ +some variables whose values are large; then do \"run\" again.\n\ +\n\ +If that works, you might want to put those \"unset-env\" commands\n\ +into a \".gdbinit\" file in this directory so they will happen every time.\n"); + /* Don't confuse user with his program's symbols on sh's data. */ + stop_print_frame = 0; + } + + if (inferior_pid == 0) + return; + + /* Select innermost stack frame except on return from a stack dummy routine, + or if the program has exited. */ + if (!stop_stack_dummy) + { + select_frame (stop_frame, 0); + + if (stop_print_frame) + { + if (stop_breakpoint > 0) + printf ("\nBpt %d, ", stop_breakpoint); + print_sel_frame (stop_step + && step_frame == stop_frame + && step_start_function == find_pc_function (stop_pc)); + /* Display the auto-display expressions. */ + do_displays (); + } + } + + /* Save the function value return registers + We might be about to restore their previous contents. */ + read_register_bytes (0, stop_registers, REGISTER_BYTES); + + if (stop_stack_dummy) + { + /* Pop the empty frame that contains the stack dummy. */ + POP_FRAME; + select_frame (read_register (FP_REGNUM), 0); + } +} + +static void +insert_step_breakpoint () +{ + if (step_resume_break_address && !step_resume_break_duplicate) + { + read_memory (step_resume_break_address, + step_resume_break_shadow, sizeof break_insn); + write_memory (step_resume_break_address, + break_insn, sizeof break_insn); + } +} + +static void +remove_step_breakpoint () +{ + if (step_resume_break_address && !step_resume_break_duplicate) + write_memory (step_resume_break_address, step_resume_break_shadow, + sizeof break_insn); +} + +/* Specify how various signals in the inferior should be handled. */ + +static void +handle_command (args, from_tty) + char *args; + int from_tty; +{ + register char *p = args; + int signum; + register int digits, wordlen; + + if (!args) + error_no_arg ("signal to handle"); + + while (*p) + { + /* Find the end of the next word in the args. */ + for (wordlen = 0; p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t'; + wordlen++); + for (digits = 0; p[digits] >= '0' && p[digits] <= '9'; digits++); + + /* If it is all digits, it is signal number to operate on. */ + if (digits == wordlen) + { + signum = atoi (p); + if (signum == SIGTRAP || signum == SIGINT) + { + if (!query ("Signal %d is used by the debugger.\nAre you sure you want to change it? ", signum)) + error ("Not confirmed."); + } + } + else if (signum == 0) + error ("First argument is not a signal number."); + + /* Else, if already got a signal number, look for flag words + saying what to do for it. */ + else if (!strncmp (p, "stop", wordlen)) + { + signal_stop[signum] = 1; + signal_print[signum] = 1; + } + else if (wordlen >= 2 && !strncmp (p, "print", wordlen)) + signal_print[signum] = 1; + else if (wordlen >= 2 && !strncmp (p, "pass", wordlen)) + signal_program[signum] = 1; + else if (!strncmp (p, "ignore", wordlen)) + signal_program[signum] = 0; + else if (wordlen >= 3 && !strncmp (p, "nostop", wordlen)) + signal_stop[signum] = 0; + else if (wordlen >= 4 && !strncmp (p, "noprint", wordlen)) + { + signal_print[signum] = 0; + signal_stop[signum] = 0; + } + else if (wordlen >= 4 && !strncmp (p, "nopass", wordlen)) + signal_program[signum] = 0; + else if (wordlen >= 3 && !strncmp (p, "noignore", wordlen)) + signal_program[signum] = 1; + /* Not a number and not a recognized flag word => complain. */ + else + { + p[wordlen] = 0; + error ("Unrecognized flag word: \"%s\".", p); + } + + /* Find start of next word. */ + p += wordlen; + while (*p == ' ' || *p == '\t') p++; + } + + if (from_tty) + { + /* Show the results. */ + printf ("Number\tStop\tPrint\tPass to program\tDescription\n"); + printf ("%d\t", signum); + printf ("%s\t", signal_stop[signum] ? "Yes" : "No"); + printf ("%s\t", signal_print[signum] ? "Yes" : "No"); + printf ("%s\t\t", signal_program[signum] ? "Yes" : "No"); + printf ("%s\n", sys_siglist[signum]); + } +} + +/* Print current contents of the tables set by the handle command. */ + +static void +signals_info (signum_exp) + char *signum_exp; +{ + register int i; + printf ("Number\tStop\tPrint\tPass to program\tDescription\n"); + + if (signum_exp) + { + i = parse_and_eval_address (signum_exp); + printf ("%d\t", i); + printf ("%s\t", signal_stop[i] ? "Yes" : "No"); + printf ("%s\t", signal_print[i] ? "Yes" : "No"); + printf ("%s\t\t", signal_program[i] ? "Yes" : "No"); + printf ("%s\n", sys_siglist[i]); + return; + } + + printf ("\n"); + for (i = 0; i < NSIG; i++) + { + QUIT; + if (i > 0 && i % 16 == 0) + { + printf ("[Type Return to see more]"); + fflush (stdout); + read_line (); + } + printf ("%d\t", i); + printf ("%s\t", signal_stop[i] ? "Yes" : "No"); + printf ("%s\t", signal_print[i] ? "Yes" : "No"); + printf ("%s\t\t", signal_program[i] ? "Yes" : "No"); + printf ("%s\n", sys_siglist[i]); + } + + printf ("\nUse the \"handle\" command to change these tables.\n"); +} + +static +initialize () +{ + register int i; + + add_info ("signals", signals_info, + "What debugger does when program gets various signals.\n\ +Specify a signal number as argument to print info on that signal only."); + + add_com ("handle", class_run, handle_command, + "Specify how to handle a signal.\n\ +Args are signal number followed by flags.\n\ +Flags allowed are \"stop\", \"print\", \"pass\",\n\ + \"nostop\", \"noprint\" or \"nopass\".\n\ +Print means print a message if this signal happens.\n\ +Stop means reenter debugger if this signal happens (implies print).\n\ +Pass means let program see this signal; otherwise program doesn't know.\n\ +Pass and Stop may be combined."); + + for (i = 0; i < NSIG; i++) + { + signal_stop[i] = 1; + signal_print[i] = 1; + signal_program[i] = 1; + } + + /* Signals caused by debugger's own actions + should not be given to the program afterwards. */ + signal_program[SIGTRAP] = 0; + signal_program[SIGINT] = 0; + + /* Signals that are not errors should not normally enter the debugger. */ +#ifdef SIGALRM + signal_stop[SIGALRM] = 0; + signal_print[SIGALRM] = 0; +#endif /* SIGALRM */ +#ifdef SIGVTALRM + signal_stop[SIGVTALRM] = 0; + signal_print[SIGVTALRM] = 0; +#endif /* SIGVTALRM */ +#ifdef SIGPROF + signal_stop[SIGPROF] = 0; + signal_print[SIGPROF] = 0; +#endif /* SIGPROF */ +#ifdef SIGCHLD + signal_stop[SIGCHLD] = 0; + signal_print[SIGCHLD] = 0; +#endif /* SIGCHLD */ +#ifdef SIGCLD + signal_stop[SIGCLD] = 0; + signal_print[SIGCLD] = 0; +#endif /* SIGCLD */ +#ifdef SIGIO + signal_stop[SIGIO] = 0; + signal_print[SIGIO] = 0; +#endif /* SIGIO */ +#ifdef SIGURG + signal_stop[SIGURG] = 0; + signal_print[SIGURG] = 0; +#endif /* SIGURG */ +} + +END_FILE |