80 lines
		
	
	
		
			2.1 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			80 lines
		
	
	
		
			2.1 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| /*
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|  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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|  *
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|  * Permission to use, copy, modify, and distribute this software for any
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|  * purpose with or without fee is hereby granted, provided that the above
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|  * copyright notice and this permission notice appear in all copies.
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|  *
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|  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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|  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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|  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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|  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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|  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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|  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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|  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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|  */
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| // Test that values in /proc/uptime increment monotonically
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| // while shifting across CPUs.
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| #define _GNU_SOURCE
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| #undef NDEBUG
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| #include <assert.h>
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| #include <unistd.h>
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| #include <sys/syscall.h>
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| #include <stdlib.h>
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| #include <string.h>
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| 
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| #include <stdint.h>
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| #include <sys/types.h>
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| #include <sys/stat.h>
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| #include <fcntl.h>
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| 
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| #include "proc-uptime.h"
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| 
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| static inline int sys_sched_getaffinity(pid_t pid, unsigned int len, unsigned long *m)
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| {
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| 	return syscall(SYS_sched_getaffinity, pid, len, m);
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| }
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| 
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| static inline int sys_sched_setaffinity(pid_t pid, unsigned int len, unsigned long *m)
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| {
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| 	return syscall(SYS_sched_setaffinity, pid, len, m);
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| }
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| 
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| int main(void)
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| {
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| 	unsigned int len;
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| 	unsigned long *m;
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| 	unsigned int cpu;
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| 	uint64_t u0, u1, i0, i1;
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| 	int fd;
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| 
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| 	/* find out "nr_cpu_ids" */
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| 	m = NULL;
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| 	len = 0;
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| 	do {
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| 		len += sizeof(unsigned long);
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| 		free(m);
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| 		m = malloc(len);
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| 	} while (sys_sched_getaffinity(0, len, m) == -EINVAL);
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| 
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| 	fd = open("/proc/uptime", O_RDONLY);
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| 	assert(fd >= 0);
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| 
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| 	proc_uptime(fd, &u0, &i0);
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| 	for (cpu = 0; cpu < len * 8; cpu++) {
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| 		memset(m, 0, len);
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| 		m[cpu / (8 * sizeof(unsigned long))] |= 1UL << (cpu % (8 * sizeof(unsigned long)));
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| 
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| 		/* CPU might not exist, ignore error */
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| 		sys_sched_setaffinity(0, len, m);
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| 
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| 		proc_uptime(fd, &u1, &i1);
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| 		assert(u1 >= u0);
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| 		assert(i1 >= i0);
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| 		u0 = u1;
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| 		i0 = i1;
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| 	}
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| 
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| 	return 0;
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| }
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