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#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "iochannel.h"
struct iochannel {
int ifd, ofd;
struct mainloop* mainloop;
void (*callback)(struct iochannel*io, void *userdata);
void*userdata;
int readable;
int writable;
struct mainloop_source* input_source, *output_source;
};
static void enable_mainloop_sources(struct iochannel *io) {
assert(io);
if (io->input_source == io->output_source) {
enum mainloop_io_event e = MAINLOOP_IO_EVENT_NULL;
assert(io->input_source);
if (!io->readable)
e |= MAINLOOP_IO_EVENT_IN;
if (!io->writable)
e |= MAINLOOP_IO_EVENT_OUT;
mainloop_source_io_set_events(io->input_source, e);
} else {
if (io->input_source)
mainloop_source_io_set_events(io->input_source, io->readable ? MAINLOOP_IO_EVENT_NULL : MAINLOOP_IO_EVENT_IN);
if (io->output_source)
mainloop_source_io_set_events(io->output_source, io->writable ? MAINLOOP_IO_EVENT_NULL : MAINLOOP_IO_EVENT_OUT);
}
}
static void callback(struct mainloop_source*s, int fd, enum mainloop_io_event events, void *userdata) {
struct iochannel *io = userdata;
int changed = 0;
assert(s && fd >= 0 && userdata);
if ((events & MAINLOOP_IO_EVENT_IN) && !io->readable) {
io->readable = 1;
changed = 1;
}
if ((events & MAINLOOP_IO_EVENT_OUT) && !io->writable) {
io->writable = 1;
changed = 1;
}
if (changed) {
enable_mainloop_sources(io);
if (io->callback)
io->callback(io, io->userdata);
}
}
static void make_nonblock_fd(int fd) {
int v;
if ((v = fcntl(fd, F_GETFL)) >= 0)
if (!(v & O_NONBLOCK))
fcntl(fd, F_SETFL, v|O_NONBLOCK);
}
struct iochannel* iochannel_new(struct mainloop*m, int ifd, int ofd) {
struct iochannel *io;
assert(m && (ifd >= 0 || ofd >= 0));
io = malloc(sizeof(struct iochannel));
io->ifd = ifd;
io->ofd = ofd;
io->mainloop = m;
io->userdata = NULL;
io->callback = NULL;
io->readable = 0;
io->writable = 0;
if (ifd == ofd) {
assert(ifd >= 0);
make_nonblock_fd(io->ifd);
io->input_source = io->output_source = mainloop_source_new_io(m, ifd, MAINLOOP_IO_EVENT_IN|MAINLOOP_IO_EVENT_OUT, callback, io);
} else {
if (ifd >= 0) {
make_nonblock_fd(io->ifd);
io->input_source = mainloop_source_new_io(m, ifd, MAINLOOP_IO_EVENT_IN, callback, io);
} else
io->input_source = NULL;
if (ofd >= 0) {
make_nonblock_fd(io->ofd);
io->output_source = mainloop_source_new_io(m, ofd, MAINLOOP_IO_EVENT_OUT, callback, io);
} else
io->output_source = NULL;
}
return io;
}
void iochannel_free(struct iochannel*io) {
assert(io);
if (io->ifd >= 0)
close(io->ifd);
if (io->ofd >= 0 && io->ofd != io->ifd)
close(io->ofd);
if (io->input_source)
mainloop_source_free(io->input_source);
if (io->output_source && io->output_source != io->input_source)
mainloop_source_free(io->output_source);
free(io);
}
int iochannel_is_readable(struct iochannel*io) {
assert(io);
return io->readable;
}
int iochannel_is_writable(struct iochannel*io) {
assert(io);
return io->writable;
}
ssize_t iochannel_write(struct iochannel*io, const void*data, size_t l) {
ssize_t r;
assert(io && data && l && io->ofd >= 0);
if ((r = write(io->ofd, data, l)) >= 0) {
io->writable = 0;
enable_mainloop_sources(io);
}
return r;
}
ssize_t iochannel_read(struct iochannel*io, void*data, size_t l) {
ssize_t r;
assert(io && data && l && io->ifd >= 0);
if ((r = read(io->ifd, data, l)) >= 0) {
io->readable = 0;
enable_mainloop_sources(io);
}
return r;
}
void iochannel_set_callback(struct iochannel*io, void (*callback)(struct iochannel*io, void *userdata), void *userdata) {
assert(io);
io->callback = callback;
io->userdata = userdata;
}
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