diff options
Diffstat (limited to 'src/clock/s6-clockadd.c')
-rw-r--r-- | src/clock/s6-clockadd.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/clock/s6-clockadd.c b/src/clock/s6-clockadd.c new file mode 100644 index 0000000..990f3ba --- /dev/null +++ b/src/clock/s6-clockadd.c @@ -0,0 +1,58 @@ +/* ISC license. */ + +#include <skalibs/sgetopt.h> +#include <skalibs/uint.h> +#include <skalibs/allreadwrite.h> +#include <skalibs/strerr2.h> +#include <skalibs/tai.h> + +#define USAGE "s6-clockadd [ -f ] [ -e errmax ]" +#define dieusage() strerr_dieusage(100, USAGE) + +int main (int argc, char const *const *argv) +{ + tain_t now, adj ; + unsigned int emax = 2000 ; + int flagforce = 0 ; + PROG = "s6-clockadd" ; + { + subgetopt_t l = SUBGETOPT_ZERO ; + for (;;) + { + register int opt = subgetopt_r(argc, argv, "fe:", &l) ; + if (opt == -1) break ; + switch (opt) + { + case 'f' : flagforce = 1 ; break ; + case 'e' : if (!uint0_scan(l.arg, &emax)) dieusage() ; break ; + default : dieusage() ; + } + } + argc -= l.ind ; argv += l.ind ; + } + { + char buf[TAIN_PACK] ; + if (allread(0, buf, TAIN_PACK) < TAIN_PACK) + strerr_diefu1sys(111, "read 16 bytes from stdin") ; + tain_unpack(buf, &adj) ; + } + tain_from_millisecs(&now, emax) ; + if (tain_less(&now, &adj)) + { + tain_t tmp = TAIN_ZERO ; + tain_sub(&tmp, &tmp, &adj) ; + if (tain_less(&now, &tmp)) + { + char fmt[UINT_FMT] ; + fmt[uint_fmt(fmt, emax)] = 0 ; + if (flagforce) + strerr_warnw3x("time discrepancy bigger than ", fmt, " milliseconds") ; + else + strerr_dief3x(1, "time discrepancy bigger than ", fmt, " milliseconds") ; + } + } + if (!sysclock_get(&now)) strerr_diefu1sys(111, "sysclock_get") ; + tain_add(&now, &now, &adj) ; + if (!sysclock_set(&now)) strerr_diefu1sys(111, "sysclock_set") ; + return 0 ; +} |