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#include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> static const char *state_path = "/sys/power/state"; int main(void) { int fd = open(state_path, O_WRONLY | O_TRUNC); if (fd != -1) { write(fd, "mem", 3); close(fd); } else { perror(state_path); return errno; } return 0; }