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#
include
<
stdio.
h>
int
main(
int
argc,
char
*
argv[
]
)
{
while
(
1)
{
printf
(
"%d\n"
,
time
(
NULL
)
)
;
sleep
(
2)
;
}
return
0;
}
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#
include
<
unistd.
h>
unsigned
int
sleep
(
unsigned
int
seconds)
;
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#
include
<
unistd.
h>
int
usleep
(
useconds_t usec)
;
Feature Test
Macro Requirements for
glibc (
see feature_test_macros(
7)
)
:
usleep
(
)
:
_BSD_SOURCE |
|
_XOPEN_SOURCE >
=
500
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