diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2016-04-10 02:52:31 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2016-04-10 02:52:31 +0200 |
| commit | 5e37087451d857f3d329341319511d00f0c49c38 (patch) | |
| tree | 29de45583b7b71cf158e3fe37295517df8dedae2 /sys/src/ape/lib/ap/plan9 | |
| parent | 3ba1197aeb382e1750cbb0f2567794bd4482e1e2 (diff) | |
ape: add internal _NSEC() function and make gettimeofday() use it
Diffstat (limited to 'sys/src/ape/lib/ap/plan9')
| -rw-r--r-- | sys/src/ape/lib/ap/plan9/9nsec.c | 43 | ||||
| -rw-r--r-- | sys/src/ape/lib/ap/plan9/mkfile | 1 |
2 files changed, 44 insertions, 0 deletions
diff --git a/sys/src/ape/lib/ap/plan9/9nsec.c b/sys/src/ape/lib/ap/plan9/9nsec.c new file mode 100644 index 000000000..87d2e8a68 --- /dev/null +++ b/sys/src/ape/lib/ap/plan9/9nsec.c @@ -0,0 +1,43 @@ +#include "sys9.h" + +typedef unsigned long long uvlong; +typedef long long vlong; +typedef unsigned char uchar; + +static uvlong order = 0x0001020304050607ULL; + +static void +be2vlong(vlong *to, uchar *f) +{ + uchar *t, *o; + int i; + + t = (uchar*)to; + o = (uchar*)ℴ + for(i = 0; i < 8; i++) + t[o[i]] = f[i]; +} + +long long +_NSEC(void) +{ + uchar b[8]; + vlong t; + int opened; + static int fd = -1; + + opened = 0; + for(;;) { + if(fd < 0) + if(opened++ || + (fd = _OPEN("/dev/bintime", OREAD|OCEXEC)) < 0) + return 0; + if(_PREAD(fd, b, sizeof b, 0) == sizeof b) + break; /* leave fd open for future use */ + /* short read, perhaps try again */ + _CLOSE(fd); + fd = -1; + } + be2vlong(&t, b); + return t; +} diff --git a/sys/src/ape/lib/ap/plan9/mkfile b/sys/src/ape/lib/ap/plan9/mkfile index 502d00f8b..1da4318a4 100644 --- a/sys/src/ape/lib/ap/plan9/mkfile +++ b/sys/src/ape/lib/ap/plan9/mkfile @@ -11,6 +11,7 @@ OFILES=\ _getpw.$O\ _nap.$O\ 9mallocz.$O\ + 9nsec.$O\ 9iounit.$O\ 9read.$O\ 9readn.$O\ |