flux_stat_watcher_create(3)¶
SYNOPSIS¶
#include <flux/core.h>
typedef void (*flux_watcher_f)(flux_reactor_t *r,
flux_watcher_t *w,
int revents, void *arg);
flux_watcher_t *flux_stat_watcher_create (flux_reactor_t *r,
const char *path,
double interval,
flux_watcher_f callback,
void *arg);
void flux_stat_watcher_get_rstat (flux_watcher_t *w,
struct stat *stat,
struct stat *prev);
DESCRIPTION¶
flux_stat_watcher_create() creates a reactor watcher that
monitors for changes in the status of the file system object
represented by path. If the file system object exists,
inotify(7) is used, if available; otherwise the reactor polls
the file every interval seconds. A value of zero selects a
conservative default (currently five seconds).
The callback revents argument should be ignored.
flux_stat_watcher_get_rstat () may be used to obtain the status
within callback. If non-NULL, stat receives the current status.
If non-NULL, prev receives the previous status.
If the object does not exist, stat->st_nlink will be zero and other status fields are undefined. The appearance/disappearance of a file is considered a status change like any other.
RETURN VALUE¶
flux_stat_watcher_create() returns a flux_watcher_t object on success. On error, NULL is returned, and errno is set appropriately.
ERRORS¶
- ENOMEM
Out of memory.