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always '[0] cancel' and '[1] all'. Typing 1 sets a breakpoint at each definition of
function, and typing 0 aborts the break command without setting any new breakpoints.
For example, the following session excerpt shows an attempt to set a breakpoint at the
overloaded symbol String::after. We choose three particular definitions of that function
name:
((gdb)) b String::after
[0] cancel
[1] all
[2] file:String.cc; line number:867
[3] file:String.cc; line number:860
[4] file:String.cc; line number:875
[5] file:String.cc; line number:853
[6] file:String.cc; line number:846
[7] file:String.cc; line number:735
> 2 4 6
Breakpoint 1 at 0xb26c: file String.cc, line 867.
Breakpoint 2 at 0xb344: file String.cc, line 875.
Breakpoint 3 at 0xafcc: file String.cc, line 846.
Multiple breakpoints were set.
Use the "delete" command to delete unwanted
breakpoints.
((gdb))
5.1.8 “Cannot insert breakpoints”
Under some operating systems, breakpoints cannot be used in a program if any other
process is running that program. In this situation, attempting to run or continue a
program with a breakpoint causes GDB to print an error message:
Cannot insert breakpoints.
The same program may be running in another process.
When this happens, you have three ways to proceed:
1. Remove or disable the breakpoints, then continue.
2. Suspend GDB, and copy the file containing your program to a new name. Resume
GDB and use the exec-file command to specify that GDB should run your
program under that name. Then start your program again.
3. Relink your program so that the text segment is nonsharable, using the linker
option '-N'. The operating system limitation may not apply to nonsharable
executables.
A similar message can be printed if you request too many active hardware-assisted
breakpoints and watchpoints:
Stopped; cannot insert breakpoints.
You may have requested too many hardware breakpoints and watchpoints.
This message is printed when you attempt to resume the program, since only then
GDB knows exactly how many hardware breakpoints and watchpoints it needs to
insert.
5.1 Breakpoints 63