Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib/istream-file.c @ 9354:687ac828b964 HEAD
lib-index: modseqs weren't tracked properly within session when changes were done.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Tue, 01 Sep 2009 13:05:03 -0400 |
parents | b1a27ed69e60 |
children | 00cd9aacd03c |
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/* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */ /* @UNSAFE: whole file */ #include "lib.h" #include "ioloop.h" #include "istream-internal.h" #include "network.h" #include <time.h> #include <unistd.h> #include <sys/stat.h> struct file_istream { struct istream_private istream; uoff_t skip_left; unsigned int file:1; unsigned int autoclose_fd:1; unsigned int seen_eof:1; }; static void i_stream_file_close(struct iostream_private *stream) { struct file_istream *fstream = (struct file_istream *)stream; struct istream_private *_stream = (struct istream_private *)stream; if (fstream->autoclose_fd && _stream->fd != -1) { if (close(_stream->fd) < 0) i_error("file_istream.close() failed: %m"); } _stream->fd = -1; } static void i_stream_file_destroy(struct iostream_private *stream) { struct istream_private *_stream = (struct istream_private *)stream; i_free(_stream->w_buffer); } static ssize_t i_stream_file_read(struct istream_private *stream) { struct file_istream *fstream = (struct file_istream *) stream; size_t size; ssize_t ret; if (!i_stream_get_buffer_space(stream, 1, &size)) return -2; do { if (fstream->file) { ret = pread(stream->fd, stream->w_buffer + stream->pos, size, stream->istream.v_offset + (stream->pos - stream->skip)); } else if (fstream->seen_eof) { /* don't try to read() again. EOF from keyboard (^D) requires this to work right. */ ret = 0; } else { ret = read(stream->fd, stream->w_buffer + stream->pos, size); } } while (unlikely(ret < 0 && errno == EINTR && stream->istream.blocking)); if (ret == 0) { /* EOF */ stream->istream.eof = TRUE; fstream->seen_eof = TRUE; return -1; } if (unlikely(ret < 0)) { if (errno == EINTR || errno == EAGAIN) { i_assert(!stream->istream.blocking); ret = 0; } else { i_assert(errno != 0); stream->istream.stream_errno = errno; return -1; } } if (ret > 0 && fstream->skip_left > 0) { i_assert(!fstream->file); i_assert(stream->skip == stream->pos); if (fstream->skip_left >= (size_t)ret) { fstream->skip_left -= ret; ret = 0; } else { ret -= fstream->skip_left; stream->pos += fstream->skip_left; stream->skip += fstream->skip_left; fstream->skip_left = 0; } } stream->pos += ret; i_assert(ret != 0 || !fstream->file); i_assert(ret != -1); return ret; } static void i_stream_file_seek(struct istream_private *stream, uoff_t v_offset, bool mark ATTR_UNUSED) { struct file_istream *fstream = (struct file_istream *) stream; if (!stream->istream.seekable) { if (v_offset < stream->istream.v_offset) { stream->istream.stream_errno = ESPIPE; return; } fstream->skip_left += v_offset - stream->istream.v_offset; } stream->istream.v_offset = v_offset; stream->skip = stream->pos = 0; fstream->seen_eof = FALSE; } static void i_stream_file_sync(struct istream_private *stream) { if (!stream->istream.seekable) { /* can't do anything or data would be lost */ return; } stream->skip = stream->pos = 0; } static const struct stat * i_stream_file_stat(struct istream_private *stream, bool exact ATTR_UNUSED) { struct file_istream *fstream = (struct file_istream *) stream; if (fstream->file) { if (fstat(fstream->istream.fd, &fstream->istream.statbuf) < 0) { i_error("file_istream.fstat() failed: %m"); return NULL; } } return &stream->statbuf; } struct istream *i_stream_create_fd(int fd, size_t max_buffer_size, bool autoclose_fd) { struct file_istream *fstream; struct stat st; fstream = i_new(struct file_istream, 1); fstream->autoclose_fd = autoclose_fd; fstream->istream.iostream.close = i_stream_file_close; fstream->istream.iostream.destroy = i_stream_file_destroy; fstream->istream.max_buffer_size = max_buffer_size; fstream->istream.read = i_stream_file_read; fstream->istream.seek = i_stream_file_seek; fstream->istream.sync = i_stream_file_sync; fstream->istream.stat = i_stream_file_stat; /* if it's a file, set the flags properly */ if (fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) { fstream->file = TRUE; fstream->istream.istream.blocking = TRUE; fstream->istream.istream.seekable = TRUE; } fstream->istream.istream.readable_fd = TRUE; return i_stream_create(&fstream->istream, NULL, fd); }