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/*
* bufio.c - Buffered, selectable I/O on pipes.
*
* Copyright (c) 1994, 1995, 1996 Eric Schenk.
* Copyright (c) 1999 Mike Jagdis.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*/
#include "diald.h"
void pipe_init(char *name, int access, int fd, PIPE *pipe, int flush)
{
char buf[2];
pipe->name = name;
pipe->access = access;
pipe->fd = fd;
pipe->count = 0;
fcntl(fd,F_SETFL,fcntl(fd,F_GETFL)|O_NONBLOCK);
pipe->next = pipes;
pipes = pipe;
if (flush) {
/* clear out any old garbage from the FIFO */
while (read(fd,buf,1) > 0);
}
}
/* Read from the file descriptor, and
* the return the number of characters in the buffer.
* This all assumes that there are some characters to read.
*/
int pipe_read(PIPE *pipe)
{
int i;
if (pipe->count == sizeof(pipe->buf)) {
return pipe->count; /* No room for more input */
}
i = read(pipe->fd, pipe->buf+pipe->count, sizeof(pipe->buf)-pipe->count);
if (i > 0) {
pipe->count += i;
return pipe->count;
} else if (i == 0 || errno == EAGAIN) {
/* A close of a pipe is only significant if it is a control
* pipe, not if it is a capture pipe for a script.
*/
if ((pipe->access & ACCESS_MONITOR)) {
mon_syslog(LOG_NOTICE, "%s closed", pipe->name);
}
return -1;
} else if (errno == EINTR) {
return 0;
} else {
mon_syslog(LOG_ERR,"%s read error: %m", pipe->name);
return -1; /* error! shut down reader... */
}
}
/* Drop count characters from the pipe's buffer */
void pipe_flush(PIPE *pipe,int count)
{
if (count >= pipe->count) {
pipe->count = 0;
} else {
pipe->count -= count;
memmove(pipe->buf, pipe->buf+count, pipe->count);
}
}
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