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Update to detect changes in file size (to support multiple file handles...)

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This commit is contained in:
Sears Russell 2006-11-21 06:47:35 +00:00
parent a06077d12d
commit 1dbf1145ca
1 changed files with 30 additions and 3 deletions
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31
src/lladd/io/file.c
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@ -22,6 +22,17 @@ typedef struct file_impl {
char * filename; char * filename;
} file_impl; } file_impl;
static int updateEOF(stasis_handle_t * h) {
file_impl * impl = h->impl;
off_t pos = lseek(impl->fd, 0, SEEK_END);
if(pos == (off_t)-1) {
return errno;
} else {
impl->end_pos = pos;
return 0;
}
}
static int file_num_copies(stasis_handle_t * h) { return 0; } static int file_num_copies(stasis_handle_t * h) { return 0; }
static int file_num_copies_buffer(stasis_handle_t * h) { return 0; } static int file_num_copies_buffer(stasis_handle_t * h) { return 0; }
@ -43,10 +54,18 @@ static lsn_t file_start_position(stasis_handle_t *h) {
pthread_mutex_unlock(&(impl->mut)); pthread_mutex_unlock(&(impl->mut));
return ret; return ret;
} }
static lsn_t file_end_position(stasis_handle_t *h) { static lsn_t file_end_position(stasis_handle_t *h) {
file_impl * impl = (file_impl*)h->impl; file_impl * impl = (file_impl*)h->impl;
pthread_mutex_lock(&(impl->mut)); pthread_mutex_lock(&(impl->mut));
lsn_t ret = impl->end_pos; int error = updateEOF(h);
int ret;
if(error) {
h->error = error;
ret = -1;
} else {
ret = impl->end_pos;
}
pthread_mutex_unlock(&(impl->mut)); pthread_mutex_unlock(&(impl->mut));
return ret; return ret;
} }
@ -130,8 +149,13 @@ static int file_read(stasis_handle_t * h,
file_impl * impl = (file_impl*)(h->impl); file_impl * impl = (file_impl*)(h->impl);
pthread_mutex_lock(&(impl->mut)); pthread_mutex_lock(&(impl->mut));
int error = 0; int error = 0;
if(off < impl->start_pos || off + len > impl->end_pos) { if(off < impl->start_pos) {
error = EDOM; error = EDOM;
} else if(off + len > impl->end_pos) {
error = updateEOF(h);
if(!error && off + len > impl->end_pos) {
error = EDOM;
}
} }
if(!error) { if(!error) {
@ -387,7 +411,10 @@ static int file_truncate_start(stasis_handle_t * h, lsn_t new_start) {
int error = 0; int error = 0;
if(new_start > impl->end_pos) { if(new_start > impl->end_pos) {
updateEOF(h);
if(!error && new_start > impl->end_pos) {
error = EDOM; error = EDOM;
}
} else if(new_start > impl->start_pos) { } else if(new_start > impl->start_pos) {
char * tmpfile = malloc(strlen(impl->filename)+2); char * tmpfile = malloc(strlen(impl->filename)+2);
strcpy(tmpfile, impl->filename); strcpy(tmpfile, impl->filename);