2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/* nanosleep() - Sleep for a number of seconds. Author: Erik van der Kouwe
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* 25 July 2009
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*/
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#define MSEC_PER_SEC 1000
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#define USEC_PER_MSEC 1000
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#define NSEC_PER_USEC 1000
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#define USEC_PER_SEC (USEC_PER_MSEC * MSEC_PER_SEC)
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#define NSEC_PER_SEC (NSEC_PER_USEC * USEC_PER_SEC)
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int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
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{
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struct timeval timeout, timestart = { 0, 0 }, timeend;
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int errno_select, r;
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struct timespec rqt;
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/* check parameters */
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if (!rqtp)
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return EFAULT;
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if (rqtp->tv_sec < 0 ||
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rqtp->tv_nsec < 0 ||
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rqtp->tv_nsec >= NSEC_PER_SEC)
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return EINVAL;
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/* store *rqtp to make sure it is not overwritten */
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rqt = *rqtp;
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/* keep track of start time if needed */
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if (rmtp)
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{
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rmtp->tv_sec = 0;
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rmtp->tv_nsec = 0;
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if (gettimeofday(×tart, NULL) < 0)
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return -1;
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}
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/* use select to wait */
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timeout.tv_sec = rqt.tv_sec;
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timeout.tv_usec = (rqt.tv_nsec + NSEC_PER_USEC - 1) / NSEC_PER_USEC;
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r = select(0, NULL, NULL, NULL, &timeout);
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/* return remaining time only if requested */
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/* if select succeeded then we slept all time */
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if (!rmtp || r >= 0)
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return r;
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/* measure end time; preserve errno */
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errno_select = errno;
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if (gettimeofday(&timeend, NULL) < 0)
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return -1;
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errno = errno_select;
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/* compute remaining time */
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rmtp->tv_sec = rqt.tv_sec - (timeend.tv_sec - timestart.tv_sec);
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rmtp->tv_nsec = rqt.tv_nsec - (timeend.tv_usec - timestart.tv_usec) * NSEC_PER_USEC;
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/* bring remaining time into canonical form */
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while (rmtp->tv_nsec < 0)
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{
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rmtp->tv_sec -= 1;
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rmtp->tv_nsec += NSEC_PER_SEC;
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}
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while (rmtp->tv_nsec > NSEC_PER_SEC)
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{
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rmtp->tv_sec += 1;
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rmtp->tv_nsec -= NSEC_PER_SEC;
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}
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/* remaining time must not be negative */
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if (rmtp->tv_sec < 0)
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{
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rmtp->tv_sec = 0;
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rmtp->tv_nsec = 0;
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}
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return r;
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}
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