| 38 |
|
platform independent RT_PID. |
| 39 |
|
*/ |
| 40 |
|
|
| 41 |
+ |
/* On Unix, we can set flags and assign descriptors before opening a |
| 42 |
+ |
process, coupling an existing input or output to the new process rather |
| 43 |
+ |
than opening both pipes. If PF_FILT_INP is passed in the flags member of |
| 44 |
+ |
SUBPROC, then the given r stream will be attached to the standard input |
| 45 |
+ |
of the child process, and subsequent reads from that descriptor in the |
| 46 |
+ |
parent get data from the standard output of the child, instead. The |
| 47 |
+ |
returned w descriptor is set to -1, since there is no longer any way |
| 48 |
+ |
to write to the input of the child. The default r descriptor of 0 will |
| 49 |
+ |
compel the child to act as a filter on the standard input of the parent. |
| 50 |
+ |
Whatever r handle you specify, the child will filter its read operations. |
| 51 |
+ |
Note that this should be called before anything has been buffered using r. |
| 52 |
+ |
If PF_FILT_OUT is set in flags, then the given w stream will be |
| 53 |
+ |
attached to the standard output of the child, and subsequent writes |
| 54 |
+ |
to that descriptor in the parent send data to the standard input |
| 55 |
+ |
of the child. The returned r descriptor is set to -1, since |
| 56 |
+ |
there is no output to read from any longer in the child. The |
| 57 |
+ |
default w descriptor of 1 will cause the child to act as a filter |
| 58 |
+ |
on the output of the parent. Make sure to call fflush(stdout) first |
| 59 |
+ |
if any data was buffered. It is illegal to set both PF_FILT_INP and |
| 60 |
+ |
PF_FILT_OUT, as a circular process is guaranteed to hang. |
| 61 |
+ |
*/ |
| 62 |
|
|
| 63 |
+ |
|
| 64 |
|
#ifndef PIPE_BUF |
| 65 |
|
#ifdef PIPSIZ |
| 66 |
|
#define PIPE_BUF PIPSIZ |
| 72 |
|
#endif |
| 73 |
|
#endif |
| 74 |
|
#endif |
| 75 |
+ |
/* process flags */ |
| 76 |
+ |
#define PF_RUNNING 1 /* process is running */ |
| 77 |
+ |
#define PF_FILT_INP 2 /* use assigned read descriptor */ |
| 78 |
+ |
#define PF_FILT_OUT 4 /* use assigned write descriptor */ |
| 79 |
|
|
| 80 |
|
typedef struct { |
| 81 |
< |
int r; /* read handle */ |
| 82 |
< |
int w; /* write handle */ |
| 83 |
< |
int running; /* doing something */ |
| 84 |
< |
RT_PID pid; /* process ID */ |
| 81 |
> |
int flags; /* what is being done */ |
| 82 |
> |
int r; /* read handle */ |
| 83 |
> |
int w; /* write handle */ |
| 84 |
> |
RT_PID pid; /* process ID */ |
| 85 |
|
} SUBPROC; |
| 86 |
|
|
| 87 |
< |
#define SP_INACTIVE {-1,-1,0,0} /* for static initializations */ |
| 87 |
> |
#define SP_INACTIVE {0,0,1,-1} /* for static initializations */ |
| 88 |
|
|
| 89 |
|
#define close_process(pd) close_processes(pd,1) |
| 90 |
|
|
| 100 |
|
extern int win_nice(int inc); |
| 101 |
|
#endif |
| 102 |
|
|
| 103 |
+ |
extern SUBPROC sp_inactive; |
| 104 |
|
|
| 105 |
|
#ifdef __cplusplus |
| 106 |
|
} |
