Hi,
I'm trying to write a small piece of code that should be capable of getting the
command line arguments for a given process. Similar to the ps(1) tool. What I
can't figure out is how exactly to use the pr_argv field of the psinfo_t
struct...
Here's the code:
#include <procfs.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char **argv)
{
psinfo_t info;
int procfd;
if((procfd = open(*(argv + 1), O_RDONLY)) == -1)
{
perror("open");
return -1;
}
printf("opened: %s\n", *(argv + 1));
if(read(procfd, (char *) &info, sizeof(info)) < 0)
{
perror("read");
return -1;
}
printf("arg vector addr: %d\n", info.pr_argv);
/* obviously the next line won't work */
printf("cmd line: %s\n", (char *) info.pr_argv);
close(procfd);
return 0;
}
so when I execute the code like that:
$ ./a.out /proc/690/psinfo
I get something like:
arg vector addr: 134512240
cmd line:
I guess I can't just access what's on that address like that as it's outside my
process. Can you tell me how could I do what I want?
Yes I know I can use ps(1) but I wanna do it with my little piece of code if
possible.
10x
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