33 lines
755 B
C
33 lines
755 B
C
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <semaphore.h>
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/* Semaphore variable structure. */
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// taken from nptl/sysdeps/unix/sysv/linux/internaltypes.h
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struct new_sem
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{
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unsigned int value;
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int private;
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unsigned long int nwaiters;
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};
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int main(void)
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{
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struct timespec ts = {0, -1}; // set incorrect nanoseconds
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sem_t sem;
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int ret = 0;
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struct new_sem *isem = (struct new_sem *)&sem;
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sem_init(&sem, 0, 0);
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printf("before sem_timedwait(): new_sem->nwaiters = 0x%x\n", isem->nwaiters);
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if (sem_timedwait(&sem, &ts) < 0)
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printf("ERR: sem_timedwait() failed (errno=%d: %s)\n", errno, strerror(errno));
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printf("after sem_timedwait(): new_sem->nwaiters = 0x%x\n", isem->nwaiters);
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return (isem->nwaiters != 0);
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}
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