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Perror Function

What does the second argument POSIX semaphore function sem_init() do? res = sem_init(&produced, 0, 1); if (res != 0) { perror(“Semaphore creation failed”); exit(EXIT_FAILURE); } res = sem_init(&consumed, 0, 0); if (res != 0) { perror(“Semaphore creation failed”); exit(EXIT_FAILURE); } int sem_init(sem_t *sem, int pshared, unsigned int value); sem_init initializes the semaphore object pointed to [...]

C Perror

programa de c unix: ¿por qué los rendimientos descriptor de fichero el valor es 3 no 1? pls me ayude a explicar el código de abajo int main (void) (Int fd, [camino] char = "myhello" if ((fd = open (path, O_CREAT | O_TRUNC | O_WRONLY, 0644)) <0) (perror ("abierto"); salida (EXIT_FAILURE)) else (printf ("% S [...]