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Annotation of src/usr.bin/aucat/pipe.c, Revision 1.7

1.6       ratchov     1: /*
                      2:  * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16:
1.1       ratchov    17: #include <sys/time.h>
                     18: #include <sys/types.h>
1.6       ratchov    19:
1.1       ratchov    20: #include <err.h>
                     21: #include <errno.h>
                     22: #include <fcntl.h>
                     23: #include <poll.h>
                     24: #include <stdio.h>
                     25: #include <stdlib.h>
                     26: #include <unistd.h>
                     27:
                     28: #include "conf.h"
                     29: #include "pipe.h"
                     30:
                     31: struct fileops pipe_ops = {
                     32:        "pipe",
                     33:        sizeof(struct pipe),
                     34:        pipe_close,
                     35:        pipe_read,
                     36:        pipe_write,
                     37:        NULL, /* start */
                     38:        NULL, /* stop */
                     39:        pipe_nfds,
                     40:        pipe_pollfd,
                     41:        pipe_revents
                     42: };
                     43:
                     44: struct pipe *
                     45: pipe_new(struct fileops *ops, int fd, char *name)
                     46: {
                     47:        struct pipe *f;
                     48:
                     49:        f = (struct pipe *)file_new(ops, name, 1);
1.4       ratchov    50:        if (f == NULL)
                     51:                return NULL;
1.1       ratchov    52:        f->fd = fd;
                     53:        return f;
                     54: }
                     55:
                     56: unsigned
                     57: pipe_read(struct file *file, unsigned char *data, unsigned count)
                     58: {
                     59:        struct pipe *f = (struct pipe *)file;
                     60:        int n;
1.7     ! ratchov    61:
1.1       ratchov    62:        while ((n = read(f->fd, data, count)) < 0) {
                     63:                f->file.state &= ~FILE_ROK;
                     64:                if (errno == EAGAIN) {
                     65:                } else {
                     66:                        warn("%s", f->file.name);
                     67:                        file_eof(&f->file);
                     68:                }
                     69:                return 0;
                     70:        }
                     71:        if (n == 0) {
1.7     ! ratchov    72:                f->file.state &= ~FILE_ROK; /* XXX: already cleared in file_eof */
1.1       ratchov    73:                file_eof(&f->file);
                     74:                return 0;
                     75:        }
                     76:        return n;
                     77: }
                     78:
                     79:
                     80: unsigned
                     81: pipe_write(struct file *file, unsigned char *data, unsigned count)
                     82: {
                     83:        struct pipe *f = (struct pipe *)file;
                     84:        int n;
1.3       ratchov    85:
1.1       ratchov    86:        while ((n = write(f->fd, data, count)) < 0) {
                     87:                f->file.state &= ~FILE_WOK;
                     88:                if (errno == EAGAIN) {
                     89:                } else {
                     90:                        if (errno != EPIPE)
                     91:                                warn("%s", f->file.name);
                     92:                        file_hup(&f->file);
                     93:                }
                     94:                return 0;
                     95:        }
                     96:        return n;
                     97: }
                     98:
                     99: int
                    100: pipe_nfds(struct file *file) {
                    101:        return 1;
                    102: }
                    103:
                    104: int
                    105: pipe_pollfd(struct file *file, struct pollfd *pfd, int events)
                    106: {
                    107:        struct pipe *f = (struct pipe *)file;
                    108:
                    109:        pfd->fd = f->fd;
                    110:        pfd->events = events;
1.2       ratchov   111:        return (events != 0) ? 1 : 0;
1.1       ratchov   112: }
                    113:
                    114: int
                    115: pipe_revents(struct file *f, struct pollfd *pfd)
                    116: {
                    117:        return pfd->revents;
                    118: }
                    119:
                    120: void
                    121: pipe_close(struct file *file)
                    122: {
                    123:        struct pipe *f = (struct pipe *)file;
                    124:
                    125:        close(f->fd);
                    126: }