#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
+#include <errno.h>
#include <unistd.h>
+#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <pwd.h>
unsigned long getticks(void)
{
- struct timeval tv;
- gettimeofday(&tv, NULL);
/*
- * We want to use milliseconds rather than microseconds,
- * because we need a decent number of them to fit into a 32-bit
- * word so it can be used for keepalives.
+ * We want to use milliseconds rather than the microseconds or
+ * nanoseconds given by the underlying clock functions, because we
+ * need a decent number of them to fit into a 32-bit word so it
+ * can be used for keepalives.
*/
- return tv.tv_sec * TICKSPERSEC + tv.tv_usec / (1000000 / TICKSPERSEC);
+#if defined HAVE_CLOCK_GETTIME && defined HAVE_DECL_CLOCK_MONOTONIC
+ {
+ /* Use CLOCK_MONOTONIC if available, so as to be unconfused if
+ * the system clock changes. */
+ struct timespec ts;
+ if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
+ return ts.tv_sec * TICKSPERSEC +
+ ts.tv_nsec / (1000000000 / TICKSPERSEC);
+ }
+#endif
+ {
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ return tv.tv_sec * TICKSPERSEC + tv.tv_usec / (1000000 / TICKSPERSEC);
+ }
}
Filename *filename_from_str(const char *str)
}
/*
- * Set FD_CLOEXEC on a file descriptor
+ * Set and clear fcntl options on a file descriptor. We don't
+ * realistically expect any of these operations to fail (the most
+ * plausible error condition is EBADF, but we always believe ourselves
+ * to be passing a valid fd so even that's an assertion-fail sort of
+ * response), so we don't make any effort to return sensible error
+ * codes to the caller - we just log to standard error and die
+ * unceremoniously. However, nonblock and no_nonblock do return the
+ * previous state of O_NONBLOCK.
*/
-int cloexec(int fd) {
+void cloexec(int fd) {
+ int fdflags;
+
+ fdflags = fcntl(fd, F_GETFD);
+ if (fdflags < 0) {
+ fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+ if (fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC) < 0) {
+ fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+}
+void noncloexec(int fd) {
int fdflags;
fdflags = fcntl(fd, F_GETFD);
- if (fdflags == -1) return -1;
- return fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC);
+ if (fdflags < 0) {
+ fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+ if (fcntl(fd, F_SETFD, fdflags & ~FD_CLOEXEC) < 0) {
+ fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+}
+int nonblock(int fd) {
+ int fdflags;
+
+ fdflags = fcntl(fd, F_GETFL);
+ if (fdflags < 0) {
+ fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+ if (fcntl(fd, F_SETFL, fdflags | O_NONBLOCK) < 0) {
+ fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+
+ return fdflags & O_NONBLOCK;
+}
+int no_nonblock(int fd) {
+ int fdflags;
+
+ fdflags = fcntl(fd, F_GETFL);
+ if (fdflags < 0) {
+ fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+ if (fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) {
+ fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
+ exit(1);
+ }
+
+ return fdflags & O_NONBLOCK;
}
FILE *f_open(const Filename *filename, char const *mode, int is_private)