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Annotation of src/usr.bin/aucat/pipe.c, Revision 1.8

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"
1.8     ! ratchov    30: #ifdef DEBUG
        !            31: #include "dbg.h"
        !            32: #endif
1.1       ratchov    33:
                     34: struct fileops pipe_ops = {
                     35:        "pipe",
                     36:        sizeof(struct pipe),
                     37:        pipe_close,
                     38:        pipe_read,
                     39:        pipe_write,
                     40:        NULL, /* start */
                     41:        NULL, /* stop */
                     42:        pipe_nfds,
                     43:        pipe_pollfd,
                     44:        pipe_revents
                     45: };
                     46:
                     47: struct pipe *
                     48: pipe_new(struct fileops *ops, int fd, char *name)
                     49: {
                     50:        struct pipe *f;
                     51:
                     52:        f = (struct pipe *)file_new(ops, name, 1);
1.4       ratchov    53:        if (f == NULL)
                     54:                return NULL;
1.1       ratchov    55:        f->fd = fd;
                     56:        return f;
                     57: }
                     58:
                     59: unsigned
                     60: pipe_read(struct file *file, unsigned char *data, unsigned count)
                     61: {
                     62:        struct pipe *f = (struct pipe *)file;
                     63:        int n;
1.7       ratchov    64:
1.1       ratchov    65:        while ((n = read(f->fd, data, count)) < 0) {
                     66:                f->file.state &= ~FILE_ROK;
                     67:                if (errno == EAGAIN) {
1.8     ! ratchov    68: #ifdef DEBUG
        !            69:                        if (debug_level >= 4) {
        !            70:                                file_dbg(&f->file);
        !            71:                                dbg_puts(": reading blocked\n");
        !            72:                        }
        !            73: #endif
1.1       ratchov    74:                } else {
                     75:                        warn("%s", f->file.name);
                     76:                        file_eof(&f->file);
                     77:                }
                     78:                return 0;
                     79:        }
                     80:        if (n == 0) {
1.7       ratchov    81:                f->file.state &= ~FILE_ROK; /* XXX: already cleared in file_eof */
1.1       ratchov    82:                file_eof(&f->file);
                     83:                return 0;
                     84:        }
                     85:        return n;
                     86: }
                     87:
                     88:
                     89: unsigned
                     90: pipe_write(struct file *file, unsigned char *data, unsigned count)
                     91: {
                     92:        struct pipe *f = (struct pipe *)file;
                     93:        int n;
1.3       ratchov    94:
1.1       ratchov    95:        while ((n = write(f->fd, data, count)) < 0) {
                     96:                f->file.state &= ~FILE_WOK;
                     97:                if (errno == EAGAIN) {
1.8     ! ratchov    98: #ifdef DEBUG
        !            99:                        if (debug_level >= 4) {
        !           100:                                file_dbg(&f->file);
        !           101:                                dbg_puts(": writing blocked\n");
        !           102:                        }
        !           103: #endif
1.1       ratchov   104:                } else {
                    105:                        if (errno != EPIPE)
                    106:                                warn("%s", f->file.name);
                    107:                        file_hup(&f->file);
                    108:                }
                    109:                return 0;
                    110:        }
                    111:        return n;
                    112: }
                    113:
                    114: int
                    115: pipe_nfds(struct file *file) {
                    116:        return 1;
                    117: }
                    118:
                    119: int
                    120: pipe_pollfd(struct file *file, struct pollfd *pfd, int events)
                    121: {
                    122:        struct pipe *f = (struct pipe *)file;
                    123:
                    124:        pfd->fd = f->fd;
                    125:        pfd->events = events;
1.2       ratchov   126:        return (events != 0) ? 1 : 0;
1.1       ratchov   127: }
                    128:
                    129: int
                    130: pipe_revents(struct file *f, struct pollfd *pfd)
                    131: {
                    132:        return pfd->revents;
                    133: }
                    134:
                    135: void
                    136: pipe_close(struct file *file)
                    137: {
                    138:        struct pipe *f = (struct pipe *)file;
                    139:
                    140:        close(f->fd);
                    141: }