root@ozdaltx.UUCP (root) (05/29/90)
Situation:
Read characters from a pipe (one at a time) and at the same time scan
the keyboard for a command without disrupting the pipe input.
Conditions:
Stdin and stdout have been closed, ttfp has been opened
for reading and writing (fopen w/r+). CBREAK (only) is in effect.
What happens:
The pipe is read successfully, but the program waits until some key
is struck on the keyboard before it prints anything else from the
pipe.
I have tried fgetc, fscanf and just about everything else I can think
of.... What am I missing (see below)?
Thanks in advance...
Scotty
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AIDS INFORMATION EXCHANGE BBS (214) 247-2367/247-5609
"Education is the best weapon"
{mic,void,egsner}!ozdaltx!sysop || {uunet,smu,ames}!sulaco!ozdaltx!sysop
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int pread()
{ /* reads the pipe and displays one char at a time
** while checking the keyboard for input
*/
FILE *fd; /* fd is the PIPE pointer created earlier */
int q;
int rc;
char rcmd[1][3];
int c;
rcmd[0][0]='\0';
q = 0;
if((fd = fopen(PIPE, "r+")) == 0){
return(0);
}
setbuf(fd, 0);
while(1) {
rc = getc(fd);
putc(rc,ttfp); /* put a char from the pipe to the tty*/
q=0;
if(isspace(rc)){
fflush(fd);
fread(rcmd,1,1,ttfp); /* ttfp is opened [r+] in main() as the tty */
fflush(ttfp);
c='\0';
c = (int)rcmd[0][0];
if(c == ':'){
fprintf(ttfp,"\nCommand: ");
c=getc(ttfp);
switch(c){
case 'Q':
case 'q':
fclose(fd);
return(0);
}
}
c='\0';
}
}
fclose(fd);
return(0);
}