popen(2)

[Dag Leine]

Hallo,

I've just played aroudn with the popen(2)-call. After getting a
segmentation fault on a quite old OpenBSD 3.8 machine I've tried to
understand the source.

    /usr/src/lib/libc/gen/popen.c

what I am missing is the initialization of *pidlist. If I initialize
this static pointer with NULL everything seems to work fine.

Did I missunderstand the source or the usage of popen??

Thanks for Comments
  Dag


The simple test programm (which dies only on ONE machine):


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

FILE *p;

int main(void)
{
  if(NULL == (p = popen("/bin/cat", "w")))
  {
    printf("popen() failed\n");
    exit(1);
  }
  fprintf(p, "hallo to pipe\n");
  printf("pclose exiting with %d\n", pclose(p));

  return(0);
}