72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Test name: test01.c
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*
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* Objective: The purpose of this test is to make sure that the timeout mechanisms
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* work without errors.
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*
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* Description: Executes a select as if it was a sleep and compares the time it
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* has been actually sleeping against the specified time in the select call.
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* Three cases are tested: first, a timeout specified in seconds, second, a timeout in
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* microseconds, and third, a timeout with more precision than seconds.
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*
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* Jose M. Gomez
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*/
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#include <sys/types.h>
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#include <sys/select.h>
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#include <time.h>
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#include <stdio.h>
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#include <errno.h>
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#define SECONDS 3
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#define USECONDS 3000000L
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int main(void) {
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int r;
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time_t start, end; /* variables for timing */
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struct timeval timeout; /* timeout structure */
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/* Set timeout for 3 seconds */
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timeout.tv_sec = SECONDS;
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timeout.tv_usec = 0;
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printf("Sleeping now for %d seconds...\n", SECONDS);
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/* Record time before starting */
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start = time(NULL);
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r = select(0, NULL, NULL, NULL, &timeout);
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printf("select return code: %d error: %s\n",
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r, strerror(errno));
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end = time(NULL);
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printf("For a timeout with select of %d seconds, it took %d actual seconds\n",
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SECONDS, end-start);
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/* Set timeout for 3 seconds , but specified in microseconds */
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timeout.tv_sec = 0;
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timeout.tv_usec = USECONDS;
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printf("\n***************************\n");
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printf("Sleeping now for %ld microseconds...\n", USECONDS);
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/* Record time before starting */
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start = time(NULL);
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r = select(0, NULL, NULL, NULL, &timeout);
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printf("select return code: %d error: %s\n",
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r, strerror(errno));
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end = time(NULL);
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printf("For a timeout with select of %ld useconds, it took %d actual seconds\n",
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USECONDS, end-start);
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/* Set timeout for 1.5 seconds, but specified in microseconds */
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timeout.tv_sec = 0;
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timeout.tv_usec = USECONDS/2;
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printf("\n***************************\n");
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printf("Sleeping now for %ld microseconds...\n", USECONDS/2);
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/* Record time before starting */
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start = time(NULL);
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r = select(0, NULL, NULL, NULL, &timeout);
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printf("select return code: %d error: %s\n",
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r, strerror(errno));
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end = time(NULL);
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printf("For a timeout with select of %ld useconds, it took %d actual seconds\n",
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USECONDS/2, end-start);
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return 0;
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}
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