gdb issues no such file or directory

[bedroomCod3r]

Hi,

I'm having a problem regarding gdb. The gdb keeps on displaying no such file or directory every time I use step command in printf();. This surprise me because I don't have this problem on my previous installation (lucid). I don't know whats going on.

Below is the log of the session.



******@g****:~/programs/any$ gdb ./myprg

GNU gdb (GDB) 7.1-ubuntu

Copyright (C) 2010 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details.

This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/carl/programs/any/myprg...done.
(gdb) list
1 /* This simple program purpose is to test the debugger */
2 #include <stdio.h>
3 #define MAX 32
4 int main()
5 {
6 int num = 0;
7 int i, ch;
8 char name[MAX];
9
10 printf("%s", "Enter String here: ");
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
12 name[i] = ch;
13 name[i] = '\0';
14
15 printf("%s", "Enter number: ");
16 scanf("%d", &num);
17
18 printf("%s%s\n", "Your name is ", name);
19 printf("%s%d\n", "Your inputed number is ", num);
20
(gdb)
21 return 0;
22 }
(gdb) break 10
Breakpoint 1 at 0x80484c1: file myprg.c, line 10.
(gdb) run
Starting program: /home/****/programs/any/myprg

Breakpoint 1, main () at myprg.c:10
10 printf("%s", "Enter String here: ");
(gdb) step
__printf (format=0x8048650 "%s") at printf.c:29
29 printf.c: No such file or directory.
in printf.c
(gdb) q
A debugging session is active.

Inferior 1 [process 1948] will be killed.
Quit anyway? (y or n) y
***@****:~/programs/any$



Tried some simple troubleshooting by adding -d flag but no luck




****@*****:~/programs/any$ gdb -d /usr/include/ ./myprg
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/****/programs/any/myprg...done.
(gdb) list
1 /* This simple program purpose is to test the debugger */
2 #include <stdio.h>
3 #define MAX 32
4 int main()
5 {
6 int num = 0;
7 int i, ch;
8 char name[MAX];
9
10 printf("%s", "Enter String here: ");
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
12 name[i] = ch;
13 name[i] = '\0';
14
15 printf("%s", "Enter number: ");
16 scanf("%d", &num);
17
18 printf("%s%s\n", "Your name is ", name);
19 printf("%s%d\n", "Your inputed number is ", num);
20
(gdb)
21 return 0;
22 }
(gdb) break 10
Breakpoint 1 at 0x80484c1: file myprg.c, line 10.
(gdb) step
The program is not being run.
(gdb) run
Starting program: /home/***/programs/any/myprg

Breakpoint 1, main () at myprg.c:10
10 printf("%s", "Enter String here: ");
(gdb) step
__printf (format=0x8048650 "%s") at printf.c:29
29 printf.c: No such file or directory.
in printf.c
(gdb) q
A debugging session is active.

Inferior 1 [process 2128] will be killed.

Quit anyway? (y or n) y
*****@*****:~/programs/any$


Need your guidance,

Thank you

[karlson]

Hi,

I'm having a problem regarding gdb. The gdb keeps on displaying no such file or directory every time I use step command in printf();. This surprise me because I don't have this problem on my previous installation (lucid). I don't know whats going on.

Below is the log of the session.

******@g****:~/programs/any$ gdb ./myprg

GNU gdb (GDB) 7.1-ubuntu

Copyright (C) 2010 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details.

This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/carl/programs/any/myprg...done.
(gdb) list
1 /* This simple program purpose is to test the debugger */
2 #include <stdio.h>
3 #define MAX 32
4 int main()
5 {
6 int num = 0;
7 int i, ch;
8 char name[MAX];
9
10 printf("%s", "Enter String here: ");
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
12 name[i] = ch;
13 name[i] = '\0';
14
15 printf("%s", "Enter number: ");
16 scanf("%d", &num);
17
18 printf("%s%s\n", "Your name is ", name);
19 printf("%s%d\n", "Your inputed number is ", num);
20
(gdb)
21 return 0;
22 }
(gdb) break 10
Breakpoint 1 at 0x80484c1: file myprg.c, line 10.
(gdb) run
Starting program: /home/****/programs/any/myprg

Breakpoint 1, main () at myprg.c:10
10 printf("%s", "Enter String here: ");
(gdb) step
__printf (format=0x8048650 "%s") at printf.c:29
29 printf.c: No such file or directory.
in printf.c
(gdb) q
A debugging session is active.

Inferior 1 [process 1948] will be killed.
Quit anyway? (y or n) y
***@****:~/programs/any$



Tried some simple troubleshooting by adding -d flag but no luck



****@*****:~/programs/any$ gdb -d /usr/include/ ./myprg
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/****/programs/any/myprg...done.
(gdb) list
1 /* This simple program purpose is to test the debugger */
2 #include <stdio.h>
3 #define MAX 32
4 int main()
5 {
6 int num = 0;
7 int i, ch;
8 char name[MAX];
9
10 printf("%s", "Enter String here: ");
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
12 name[i] = ch;
13 name[i] = '\0';
14
15 printf("%s", "Enter number: ");
16 scanf("%d", &num);
17
18 printf("%s%s\n", "Your name is ", name);
19 printf("%s%d\n", "Your inputed number is ", num);
20
(gdb)
21 return 0;
22 }
(gdb) break 10
Breakpoint 1 at 0x80484c1: file myprg.c, line 10.
(gdb) step
The program is not being run.
(gdb) run
Starting program: /home/***/programs/any/myprg

Breakpoint 1, main () at myprg.c:10
10 printf("%s", "Enter String here: ");
(gdb) step
__printf (format=0x8048650 "%s") at printf.c:29
29 printf.c: No such file or directory.
in printf.c
(gdb) q
A debugging session is active.

Inferior 1 [process 2128] will be killed.

Quit anyway? (y or n) y
*****@*****:~/programs/any$


Need your guidance,

Thank you

First off when you post code use code tags.

2. Do you have debug versions of glibc and source of glibc installed so that gdb can actually go through the source.
3. Why do you want to step through printf?
4. Why do printf("%s", <string>)? While there is nothing wrong with that statement I don't see any reason not to do printf("<string>");

[bedroomCod3r]

First off when you post code use code tags.

2. Do you have debug versions of glibc and source of glibc installed so that gdb can actually go through the source.
3. Why do you want to step through printf?
4. Why do printf("%s", <string>)? While there is nothing wrong with that statement I don't see any reason not to do printf("<string>");

First off when you post code use code tags.
Whoops My mistake...

2. Do you have debug versions of glibc and source of glibc installed so that gdb can actually go through the source.

I'll Check that.. I'm using an offline linux.

3. Why do you want to step through printf?
You mean I'll use a next command instead of step?

4. Why do printf("%s", <string>)? While there is nothing wrong with that statement I don't see any reason not to do printf("<string>");

I agree, there's nothing wrong with printf("<string>");. I was using a book by Ira Pohl ABC. A lot of examples are also in printf("%s", <string>); format. I get used of using printf("%s", <string>); format. In any case Im going to try your suggestion.

Thank You for replying

[karlson]

You mean I'll use a next command instead of step?

Right.

[Arndt]

Right.

'step' used to do the right thing, though.

[karlson]

'step' used to do the right thing, though.

If the debug version and the source code are installed I am sure it will. I just don't see a reason to do this unless you are actually trying to debug the printf function.

[Arndt]

If the debug version and the source code are installed I am sure it will. I just don't see a reason to do this unless you are actually trying to debug the printf function.

What is felt to be the right thing can depend on what you're used to, but letting 'step' go into libc code when you don't have the source code to libc is not useful.

[bedroomCod3r]

Thank you Karlson for pointing it out. I tried using the next command and the errors are gone except for the last part.



****@****:~/programs/any$ gdb ./prg2

GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/carl/programs/any/prg2...done.
(gdb) list
1 /* This simple program purpose is to test the debugger */
2 #include <stdio.h>
3 #define MAX 32
4 int main()
5 {
6 int num = 0;
7 int i, ch;
8 char name[MAX];
9
10 printf("Enter String here: ");
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
12 name[i] = ch;
13 name[i] = '\0';
14
15 printf("Enter number: ");
16 scanf("%d", &num);
17
18 printf("Your name is %s\n", name);
19 printf("Your inputed number is %d\n", num);
20
(gdb)
21 return 0;
22 }
(gdb) break 11
Breakpoint 1 at 0x80484ce: file myprg2.c, line 11.
(gdb) run
Starting program: /home/carl/programs/any/prg2

Breakpoint 1, main () at myprg2.c:11
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
(gdb) next
Enter String here: two
12 name[i] = ch;
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
(gdb)
12 name[i] = ch;
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
(gdb)
12 name[i] = ch;
(gdb)
11 for(i = 0;(ch = getchar()) != '\n' && i < 32;++i)
(gdb)
13 name[i] = '\0';
(gdb)
15 printf("Enter number: ");
(gdb)
16 scanf("%d", &num);
(gdb)
Enter number: 2222
18 printf("Your name is %s\n", name);
(gdb)
Your name is two
19 printf("Your inputed number is %d\n", num);
(gdb)
Your inputed number is 2222
21 return 0;
(gdb)
22 }
(gdb)
__libc_start_main (main=0x80484a4 <main>, argc=1, ubp_av=0xbffff4e4, init=0x8048580 <__libc_csu_init>, fini=0x8048570 <__libc_csu_fini>,
rtld_fini=0x11e030 <_dl_fini>, stack_end=0xbffff4dc) at libc-start.c:258
258 libc-start.c: No such file or directory.
in libc-start.c
(gdb)

Program exited normally.
(gdb) q
****@*****:~/programs/any$
So to remove the last error installing libc would do the job right?

[karlson]

Thank you Karlson for pointing it out. I tried using the next command and the errors are gone except for the last part.



(gdb)
__libc_start_main (main=0x80484a4 <main>, argc=1, ubp_av=0xbffff4e4, init=0x8048580 <__libc_csu_init>, fini=0x8048570 <__libc_csu_fini>,
rtld_fini=0x11e030 <_dl_fini>, stack_end=0xbffff4dc) at libc-start.c:258
258 libc-start.c: No such file or directory.
in libc-start.c
(gdb)

Program exited normally.
(gdb) q
****@*****:~/programs/any$
So to remove the last error installing libc would do the job right?

I would suggest running continue at the return statement. What you see is not really an error for me.