printing - View/Print function code from within GDB -

i trying develop simple text based user interface runs gdb commands. want user able set , break/trace point @ area of code , run debug commands.

i want user enter function needs debugged. take function name , print out source code of function, ask user select line of code @ set break/trace point. @ moment, using disassemble command can print out memory addresses user, want print actual source code instead.

can done in gdb?

currently:

dump of assembler code function test_function:    0x03800f70 <test_function+0>:  push   %ebp    0x03800f71 <test_function+1>:  mov    %esp,%ebp    0x03800f73 <test_function+3>:  sub    $0x48,%esp 

what want:

void main() {   printf("hello world\n"); } 

thanks!

edit: i'm getting this:

(gdb) list myfunction 941     directory/directory_etc/sourcefile.c: no such file or directory.         in directory/directory_etc/sourcefile.c 

then tried specifying linenum:

(gdb) list directory/directory_etc/sourcefile.c:941 936     in directory/directory_etc/sourcefile.c 

so behaviour similar describing, "list filename:linenum" still isnt working

thank you!

use:

(gdb) list function 

see online of list command details:

(gdb) list list specified function or line. no argument, lists ten more lines after or around previous listing. "list -" lists ten lines before previous ten-line listing. 1 argument specifies line, , ten lines listed around line. 2 arguments comma between specify starting , ending lines list. lines can specified in these ways:   linenum, list around line in current file,   file:linenum, list around line in file,   function, list around beginning of function,   file:function, distinguish among like-named static functions.   *address, list around line containing address. 2 args if 1 empty stands ten lines away other arg. 

for non-toy projects, you'll hit case this:

$ gdb /bin/true <...> (gdb) start <...> (gdb) list printf file: "/usr/include/bits/stdio2.h", line number: 104 file: "printf.c", line number: 29 

which lists multiple definitions of function in code base. in printf() case above, non-overloaded pure c function has 2 definitions. 1 defined in stdio2.h. can use list file:linenum form specify 1 want list:

(gdb) list printf.c:29 24   25  /* write formatted output stdout format string format.  */ 26  /* varargs1 */ 27  int 28  __printf (const char *format, ...) 29  { 30    va_list arg; 31    int done; 32   33    va_start (arg, format); 

for "sourcefile.c: no such file or directory" errors you're seeing, need tell gdb source code. see gdb manual: source path. you'll need have source code function want list on machine.