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@(#)time.3 8.1 (Berkeley) 6/4/93
$FreeBSD$
.Dd July 18, 2003 .Dt TIME 3 .Os .Sh NAME .Nm time .Nd get time of day .Sh LIBRARY .Lb libc .Sh SYNOPSIS n time.h .Ft time_t .Fn time "time_t *tloc" .Sh DESCRIPTION The .Fn time function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time. If an error occurs, .Fn time returns the value
o Vt time_t Pc Ns -1 .
p The return value is also stored in .No * Ns Va tloc , provided that .Va tloc is non-null. .Sh ERRORS The .Fn time function may fail for any of the reasons described in .Xr gettimeofday 2 . .Sh SEE ALSO .Xr clock_gettime 2 , .Xr gettimeofday 2 , .Xr ctime 3 .Sh STANDARDS The .Nm function conforms to .St -p1003.1-2001 . .Sh HISTORY A .Fn time function appeared in .At v6 . .Sh BUGS Neither .St -isoC-99 nor .St -p1003.1-2001 requires .Fn time to set .Va errno on failure; thus, it is impossible for an application to distinguish the valid time value -1 (representing the last UTC second of 1969) from the error return value.
p Systems conforming to earlier versions of the C and .Tn POSIX standards (including older versions of .Fx ) did not set .No * Ns Va tloc in the error case.