#include <sys/param.h>
#include <sys/exec.h>
#include <sys/sysctl.h>

#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <stdio.h>
#include <string.h>

static void
ps_strings(pid_t pid)
{
	kvm_t *kd;
	struct kinfo_proc *kp;
        struct ps_strings pss_sysctl, pss;
	size_t len;
	ssize_t n;
	u_long ps_strings;
        int cnt;

	kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
	if (kd == NULL)
		err(1, "kvm_open");
	kp = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
	if (kp == NULL)
		err(1, "kvm_getprocs");
	len = sizeof(ps_strings);
	if (sysctlbyname("kern.ps_strings", &ps_strings, &len, NULL, 0) == -1)
		err(1, "sysctl: kern.ps_strings");
	n = kvm_uread(kd, kp, ps_strings, (char *)&pss, sizeof(pss));
	if (n != sizeof(pss))
		errx(1, "kvm_uread");
	printf("ps_nargvstr\t%u\n", pss.ps_nargvstr);
	printf("ps_argvstr\t%p\n", pss.ps_argvstr);
	printf("ps_nenvstr\t%u\n", pss.ps_nenvstr);
	printf("ps_envstr\t%p\n", pss.ps_envstr);
}

int main (int argc, char *argv[])
{
	int i;

	if (argc < 2)
		errx(1, "usage: prog pid");

	for (i = 1; i < argc; i++)
		ps_strings(atoi(argv[i]));
}