process_open

SFL
Version 2.11

`process_open_io`

#include "sflproc.h"
int
process_open_io (
    const char *filename,
    char access_type                    /*  r, w, a                          */
)

Synopsis

Opens a file for i/o and returns a handle ready for passing to process create full(). The filename may be null or empty, in which case this function returns -2, which indicates a null file handle. If there is an error, it returns -1. Otherwise it returns a file handle >= 0.

Source Code - (sflproc.c)

{
    int
        handle,
        mode = 0,
        permissions = 0;

    if (filename == NULL || *filename == '\0')
        return (-2);                    /*  Indicates a null handle          */

#if (defined (__UNIX__) || defined (__OS2__))
    mode = O_NOCTTY;
#endif
    if (access_type == 'r')
      {
        mode += O_RDONLY;
        permissions = 0;
      }
    else
    if (access_type == 'w')
      {
        mode += O_WRONLY | O_CREAT | O_TRUNC;
        permissions = S_IREAD | S_IWRITE;
      }
    else
    if (access_type == 'a')
      {
        mode += O_WRONLY | O_CREAT | O_APPEND;
        permissions = S_IREAD | S_IWRITE;
      }
    handle = open (filename, mode, permissions);
#if (defined (WIN32))
    /*  Under Windows, we need to move the file pointer to the end of the
     *  file ourselves, for append files, since for some reason this does
     *  not happen automatically for file handles passed to subprocesses.
     */
    if (access_type == 'a')
        lseek (handle, 0, SEEK_END);
#endif

#if (defined (DEBUG))
    if (handle < 0)
        perror ("Error opening redirection stream");
#endif
    return (handle);
}

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