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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
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unistd.
h>
       unsigned
int
sleep
(
unsigned
int
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;
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include
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h>
       int
usleep
(
useconds_t usec)
;
   Feature Test
Macro Requirements for
glibc (
see feature_test_macros(
7)
)
:
       usleep
(
)
:
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|
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=
500
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