> In a Linux (2.6.34) based platform I have a process that does the
> functionality of process management by spawning other processes, monitoring
> them etc.
>
> For debugging purposes I want to spawn a process using valgrind.. So I fork
> and exec with the following parameters to execve
>
> |execvp("/usr/bin/valgrind", args);
> args is an array of character pointers..
>
> args[0] = /usr/bin/valgrind
> args[1] = --log-file=<file_name>
> args[2] = path to the program to be started in valgrind
> args[3] = argument to the program
> args[4] = '\0'|
>
> But this doesn't work. I see valgrind running, but log file is not generated
> and it doesn't see to do anything.
>
> I did an strace for an invocation of valgrind from the shell and in the exec
> call the parameters are similar to what I am passing programmatically.
>
> Any ideas what might be wrong ?
As Philippe Waroquiers suggests, add six new options "-d -d -d -v -v -v"
to the invocation of valgrind.
As I suggest, invoke valgrind under strace from your "supervisor":
args[0] = "/usr/bin/strace";
args[1] = "-f";
args[2] = "-o";
args[3] = "strace.out";
args[4] = "-e";
args[5] = "trace=file,close,dup,dup2,pipe";
args[6] = "/usr/bin/valgrind";
args[7] = "<first option to valgrind>";
...
args[K] = "./my_app";
args[1+K] = "<first argument to my_app>";
...
args[N-1] = 0;
execvp(args[0], args);
And as KISS ("Keep It Simple, Sir") suggests, try running:
args[0] = "/bin/date";
args[1] = "+%Y-%m-%d";
args[2] = 0;
execvp(args[0], args);
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