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#include <sys/time.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "conf.h"
#include "pipe.h"
struct fileops pipe_ops = {
"pipe",
sizeof(struct pipe),
pipe_close,
pipe_read,
pipe_write,
NULL, /* start */
NULL, /* stop */
pipe_nfds,
pipe_pollfd,
pipe_revents
};
struct pipe *
pipe_new(struct fileops *ops, int fd, char *name)
{
struct pipe *f;
f = (struct pipe *)file_new(ops, name, 1);
if (f == NULL)
return NULL;
f->fd = fd;
return f;
}
unsigned
pipe_read(struct file *file, unsigned char *data, unsigned count)
{
struct pipe *f = (struct pipe *)file;
int n;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (!(f->file.state & FILE_ROK)) {
DPRINTF("pipe_read: %s: bad state\n", f->file.name);
abort();
}
gettimeofday(&tv0, NULL);
#endif
while ((n = read(f->fd, data, count)) < 0) {
f->file.state &= ~FILE_ROK;
if (errno == EAGAIN) {
DPRINTFN(3, "pipe_read: %s: blocking...\n",
f->file.name);
} else {
warn("%s", f->file.name);
file_eof(&f->file);
}
return 0;
}
if (n == 0) {
DPRINTFN(2, "pipe_read: %s: eof\n", f->file.name);
f->file.state &= ~FILE_ROK;
file_eof(&f->file);
return 0;
}
#ifdef DEBUG
gettimeofday(&tv1, NULL);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTFN(us < 5000 ? 4 : 1,
"pipe_read: %s: got %d bytes in %uus\n",
f->file.name, n, us);
#endif
return n;
}
unsigned
pipe_write(struct file *file, unsigned char *data, unsigned count)
{
struct pipe *f = (struct pipe *)file;
int n;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (!(f->file.state & FILE_WOK)) {
DPRINTF("pipe_write: %s: bad state\n", f->file.name);
abort();
}
gettimeofday(&tv0, NULL);
#endif
while ((n = write(f->fd, data, count)) < 0) {
f->file.state &= ~FILE_WOK;
if (errno == EAGAIN) {
DPRINTFN(3, "pipe_write: %s: blocking...\n",
f->file.name);
} else {
if (errno != EPIPE)
warn("%s", f->file.name);
file_hup(&f->file);
}
return 0;
}
#ifdef DEBUG
gettimeofday(&tv1, NULL);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTFN(us < 5000 ? 4 : 1,
"pipe_write: %s: wrote %d bytes in %uus\n",
f->file.name, n, us);
#endif
return n;
}
int
pipe_nfds(struct file *file) {
return 1;
}
int
pipe_pollfd(struct file *file, struct pollfd *pfd, int events)
{
struct pipe *f = (struct pipe *)file;
pfd->fd = f->fd;
pfd->events = events;
return (events != 0) ? 1 : 0;
}
int
pipe_revents(struct file *f, struct pollfd *pfd)
{
return pfd->revents;
}
void
pipe_close(struct file *file)
{
struct pipe *f = (struct pipe *)file;
close(f->fd);
}
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