filter_create_fd - Create a sub process and return the requested pipes

       cmd -> the sub command to execute.  Will be executed with
       /bin/sh -c
       fdin -> pointer to return the stdin pipe, or NULL if you don't
       want the stdin pipe
       fdout -> pointer to return the stdout pipe, or NULL if you don't
       want the stdout pipe
       fderr -> pointer to return the stderr pipe, or NULL if you don't
       want the stderr pipe

       filter_create_fd and filter_create_fp are what popen

       been:  a  mechanism  to  create  sub processes and have pipes to all their input/output.  The concept was
       taken from mutt, though python has something similar with popen3/popen4.  You  control  which  pipes  the
       function  returns by the fdin/fdout/fderr arguments.  A NULL value means "don't create a pipe", a pointer
       to an int will cause the pipes to be created and the value of the file descriptor stored in the int.  You
       will have to close(2) the file descriptors yourself.

       filter_create_fd  - Create a sub process and return the requested pipes

       fdin -> the stdin file descriptor of the sub process
       fdout -> the stdout file descriptor of the sub process
       fderr -> the stderr file descriptor of the sub process
       pid -> the pid of the sub process

filter_wait(3), filter_create_fp(3), filter_create_fd

ClearSilver                                       12 July 2007                               filter_create_fd(3)

       #include <util/filter.h>

       NEOERR *filter_create_fd(const char *cmd, int *fdin, int *fdout, int *fderr,
                                pid_t *pid);