shithub: sl

ref: bfe38a2454609a60bffe2f59340b075faeca7c4d
dir: /src/posix/sys.c/

#include "sl.h"
#include "timefuncs.h"
#include <sys/mman.h>

static usize pagesize = 4096;
#define PAGEALIGNED(x) (((x) + pagesize-1) & ~(pagesize-1))

void *
sl_segalloc(usize sz)
{
	sz = PAGEALIGNED(sz);
	void *s = mmap(nil, sz, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
	if(s == (void*)-1)
		s = nil;
	return s;
}

void
sl_segfree(void *s, usize sz)
{
	if(s == nil)
		return;
	sz = PAGEALIGNED(sz);
	if(munmap(s, sz) != 0)
		abort();
}

void
sl_segused(void *s, usize sz, usize used)
{
	sz = PAGEALIGNED(sz);
	used = PAGEALIGNED(used);
	// it's fine if this fails
	madvise((u8int*)s+used, sz-used, MADV_DONTNEED);
}

double
sec_realtime(void)
{
	struct timespec now;
	if(clock_gettime(CLOCK_REALTIME, &now) != 0)
		return 0;
	return (double)now.tv_sec + (double)now.tv_nsec/1.0e9;
}

u64int
nanosec_monotonic(void)
{
	static s64int z;
	struct timespec now;

	if(clock_gettime(CLOCK_MONOTONIC, &now) != 0)
		return 0;
	if(z == 0){
		z = now.tv_sec*1000000000LL + now.tv_nsec;
		return 0;
	}
	return now.tv_sec*1000000000LL + now.tv_nsec - z;
}

void
timestring(double s, char *buf, int sz)
{
	time_t tme = (time_t)s;
	struct tm tm;

	*buf = 0;
	if(localtime_r(&tme, &tm) != nil)
		strftime(buf, sz, "%a %b %e %H:%M:%S %Y", &tm);
}

double
parsetime(const char *s)
{
	char *res;
	time_t t;
	struct tm tm;

	res = strptime(s, "%c", &tm);
	if(res != nil){
		/* Not set by strptime(); tells mktime() to determine
		 * whether daylight saving time is in effect
		 */
		tm.tm_isdst = -1;
		t = mktime(&tm);
		if(t == (time_t)-1)
			return -1;
		return (double)t;
	}
	return -1;
}

void
sleep_ms(int ms)
{
	if(ms != 0){
		struct timeval timeout;
		timeout.tv_sec = ms/1000;
		timeout.tv_usec = (ms % 1000) * 1000;
		select(0, nil, nil, nil, &timeout);
	}
}

static const u8int boot[] = {
#include "sl.boot.h"
};

char *os_version;
#include <sys/utsname.h>

int
main(int argc, char **argv)
{
	setlocale(LC_NUMERIC, "C");
	struct utsname u;
	os_version = strdup(uname(&u) == 0 ? u.release : "");
	long p = sysconf(_SC_PAGE_SIZE);
	if(p > 0)
		pagesize = p;
	slmain(boot, sizeof(boot), argc, argv);
}