diff options
Diffstat (limited to 'support/nfs/closeall.c')
-rw-r--r-- | support/nfs/closeall.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/support/nfs/closeall.c b/support/nfs/closeall.c new file mode 100644 index 0000000..e07253e --- /dev/null +++ b/support/nfs/closeall.c @@ -0,0 +1,39 @@ +/* + * support/nfs/closeall.c + * Close all file descriptors greater than some limit, + * Use readdir "/proc/self/fd" to avoid excess close(2) calls. + */ + +#include <unistd.h> +#include <stdlib.h> +#include <dirent.h> +#include <errno.h> + +#include "nfslib.h" + +void +closeall(int min) +{ + char *endp; + long n; + DIR *dir = opendir("/proc/self/fd"); + + if (dir != NULL) { + int dfd = dirfd(dir); + struct dirent *d; + + while ((d = readdir(dir)) != NULL) { + errno = 0; + n = strtol(d->d_name, &endp, 10); + if (!errno && *endp == '\0' && endp != d->d_name && + n >= min && n != dfd) + (void) close(n); + } + closedir(dir); + } else { + int fd = sysconf(_SC_OPEN_MAX); + while (--fd >= min) + if(fd >= 0) + (void) close(fd); + } +} |