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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2019-07-09 11:14:53 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2019-07-09 14:45:47 +0200 |
| commit | 5283630d2c9d40deb0183696d278e02644fe4326 (patch) | |
| tree | d5695aea058ed05d4d9a4b84b5cb9986aaefd23f /freebsd/sys/kern/subr_sbuf.c | |
| parent | EPOCH(9): Add epoch_drain_callbacks() (diff) | |
| download | rtems-libbsd-5283630d2c9d40deb0183696d278e02644fe4326.tar.bz2 | |
Update to FreeBSD stable/12 2019-07-09
Git mirror commit 3427c3416aa3c0f25124070959cca78024b94d85.
Diffstat (limited to 'freebsd/sys/kern/subr_sbuf.c')
| -rw-r--r-- | freebsd/sys/kern/subr_sbuf.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/freebsd/sys/kern/subr_sbuf.c b/freebsd/sys/kern/subr_sbuf.c index b51ed52c..c9696ab7 100644 --- a/freebsd/sys/kern/subr_sbuf.c +++ b/freebsd/sys/kern/subr_sbuf.c @@ -344,6 +344,21 @@ sbuf_setpos(struct sbuf *s, ssize_t pos) } /* + * Drain into a counter. Counts amount of data without producing output. + * Useful for cases like sysctl, where user may first request only size. + * This allows to avoid pointless allocation/freeing of large buffers. + */ +int +sbuf_count_drain(void *arg, const char *data __unused, int len) +{ + size_t *sizep; + + sizep = (size_t *)arg; + *sizep += len; + return (len); +} + +/* * Set up a drain function and argument on an sbuf to flush data to * when the sbuf buffer overflows. */ |