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xtensa hostfs: Make host_stat populate st_size

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A clumsy implementation using lseek.
This would allow more applications to use hostfs directly.

Tested lightly with CONFIG_EXAMPLES_STAT.
This commit is contained in:
YAMAMOTO Takashi 2021-03-10 11:17:33 +09:00 committed by Xiang Xiao
parent 2c753be0df
commit 16d3e787de
1 changed files with 12 additions and 1 deletions
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13
arch/xtensa/src/common/xtensa_hostfs.c
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@ -135,10 +135,21 @@ int host_dup(int fd)
int host_fstat(int fd, struct stat *buf)
{
/* XXX determine the size using lseek? */
/* Determine the size using lseek.
*
* Assumptions:
* - host_lseek never fails
* - It's ok to change the file offset temporarily as
* hostfs_semtake provides enough serialization.
*/
off_t saved_off = host_lseek(fd, 0, SEEK_CUR);
off_t size = host_lseek(fd, 0, SEEK_END);
host_lseek(fd, saved_off, SEEK_SET);
memset(buf, 0, sizeof(*buf));
buf->st_mode = S_IFREG | 0777;
buf->st_size = size;
return 0;
}