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PATCH
- From: Abhijit Halder <abhijit dot k dot halder at gmail dot com>
- To: gdb-patches at sourceware dot org
- Date: Sat, 9 Jul 2011 14:00:29 +0530
- Subject: PATCH
There is no way to pass the output of a gdb command to a shell
command. For example, something similar is not permitted: "(gdb)
thread apply all bt | vim -". This kind of feature is quite helpful in
a scenario where a program under debugger has 100s of threads running
and one wants to search a particular pattern in stack-traces. I have
implemented a feature which will allow one to pass the output of any
gdb command to any shell command.
2011-07-09 Abhijit Halder <abhijit.k.halder@symantec.com>
* top.c (execute_command_to_pipe): New function.
(execute_command): Update.
* ui-file.c (gdb_modify_io): New function.
* ui-file.h (gdb_modify_io): Add prototype.
diff -rup src//gdb/top.c dst//gdb/top.c
--- src//gdb/top.c 2011-06-28 00:51:50.000000000 +0530
+++ dst//gdb/top.c 2011-07-09 13:11:57.480044436 +0530
@@ -48,6 +48,7 @@
#include "event-loop.h"
#include "gdbthread.h"
#include "python/python.h"
+#include "ui-file.h"
/* readline include files. */
#include "readline/readline.h"
@@ -358,6 +359,20 @@ prepare_execute_command (void)
return cleanup;
}
+
+/* Run execute_command for P and FROM_TTY. Write output in pipe,
+ do not display it to the screen. */
+
+void
+execute_command_to_pipe (char *p, int from_tty, FILE *pipe)
+{
+ FILE *file;
+
+ file = gdb_modify_io (gdb_stdout, pipe);
+ execute_command (p, from_tty);
+ pipe = gdb_modify_io (gdb_stdout, file);
+ pclose (pipe);
+}
/* Execute the line P as a command, in the current user context.
Pass FROM_TTY as second argument to the defining function. */
@@ -368,7 +383,16 @@ execute_command (char *p, int from_tty)
struct cmd_list_element *c;
enum language flang;
static int warned = 0;
- char *line;
+ char *line, *sh_cmd;
+
+ if ((sh_cmd = strchr(p,'|')) != NULL)
+ {
+ FILE *pipe;
+ *sh_cmd++ = '\0';
+ pipe = popen (sh_cmd, "w");
+ execute_command_to_pipe (p, from_tty, pipe);
+ return;
+ }
cleanup = prepare_execute_command ();
diff -rup src//gdb/ui-file.c dst//gdb/ui-file.c
--- src//gdb/ui-file.c 2011-05-14 11:14:36.000000000 +0530
+++ dst//gdb/ui-file.c 2011-07-09 13:16:50.404045208 +0530
@@ -617,6 +617,21 @@ struct ui_file *
stdio_fileopen (FILE *file)
{
return stdio_file_new (file, 0);
+
+}
+
+FILE *
+gdb_modify_io (struct ui_file *file, FILE *iostream_new)
+{
+ FILE *iostream_old;
+ struct stdio_file *stdio = ui_file_data (file);
+
+ if (stdio->magic != &stdio_file_magic)
+ internal_error (__FILE__, __LINE__,
+ _("stdio_file_flush: bad magic number"));
+ iostream_old = stdio->file;
+ stdio->file = iostream_new;
+ return iostream_old;
}
struct ui_file *
diff -rup src//gdb/ui-file.h dst//gdb/ui-file.h
--- src//gdb/ui-file.h 2011-05-13 22:58:20.000000000 +0530
+++ dst//gdb/ui-file.h 2011-07-09 13:14:21.484044803 +0530
@@ -126,6 +126,9 @@ extern struct ui_file *stdio_fileopen (F
/* Open NAME returning an STDIO based UI_FILE. */
extern struct ui_file *gdb_fopen (char *name, char *mode);
+/* Modify the file pointer of an STDIO based UI_FILE. */
+FILE *gdb_modify_io (struct ui_file *file, FILE *iostream_new);
+
/* Create a file which writes to both ONE and TWO. CLOSE_ONE
and CLOSE_TWO indicate whether the original files should be
closed when the new file is closed. */