pico/osdep/popen.c

   1 /*
   2  * ========================================================================
   3  * Copyright 2006 University of Washington
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * ========================================================================
  12  */
  13
  14 #include <system.h>
  15 #include <general.h>
  16 #include "../estruct.h"
  17
  18
  19
  20
  21 /*
  22  * P_open - run the given command in a sub-shell returning a file pointer
  23  *          from which to read the output
  24  *
  25  * note:
  26  *      For OS's other than unix, you will have to rewrite this function.
  27  *      Hopefully it'll be easy to exec the command into a temporary file,
  28  *      and return a file pointer to that opened file or something.
  29  */
  30 int
  31 P_open(char *s)
  32 {
  33 #if     HAVE_POPEN
  34     extern FIOINFO g_pico_fio;
  35
  36     g_pico_fio.flags = FIOINFO_READ;
  37     g_pico_fio.name = "pipe";
  38
  39     if((g_pico_fio.fp = popen(s, "r")) != NULL)
  40       return(FIOSUC);
  41
  42     return(FIOERR);
  43 #else
  44     /* Windows never did this, but piping has been done elsewhere */
  45     return(0);
  46 #endif
  47 }
  48
  49
  50
  51 /*
  52  * P_close - close the given descriptor
  53  *
  54  */
  55 void
  56 P_close(void)
  57 {
  58 #if     HAVE_PCLOSE
  59     extern FIOINFO g_pico_fio;
  60
  61     if(g_pico_fio.fp)
  62       (void) pclose(g_pico_fio.fp);
  63 #endif
  64 }