Very Computer

1. MVS Mainframer needs help on pipes and process arguments

I've been trying for a couple of days to figure out how to get the arguments
of a running process from within a C program. I came across some code on the
net that lead me to try this. Now I'm not sure why it doesn't work. I've
been able to ensure that there are no errors, but the flow of program
execution doesn't work like the original example lead me to believe it
would.....  I'm sure, I've used "dbx" to watch the program execute.....

Is the fgets() valid for pipes??? Anybody that can help????

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
   char line[133];
   char command[80];
   FILE *fp;

   strcpy(command, "ps -efo ""%p %P %a"" 2>/dev/null");

   fp = popen(command, "r");

/* file handle is assigned, no error */

   while (!feof(fp))  /* can use feof() on file handle fp */
   {
      /* execution continues */
      if (fgets(line, sizeof(line), fp) == 0) /* fgets() returns 0, line is
null */
      {
         /* execution falls into this code on first call */
         pclose(fp);
         return 0;
      }
      else
      {
         printf(">%s<\n",line);
      }
   }

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