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proc: more robust bulk read test

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/proc may not be mounted and test will exit successfully.

Ensure proc is mounted at /proc.

Link: http://lkml.kernel.org/r/20190209105613.GA10384@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2019-03-05 15:50:42 -08:00 committed by Linus Torvalds
parent e483b02087
commit 332e0e804d
1 changed files with 14 additions and 0 deletions
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14
tools/testing/selftests/proc/read.c
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@ -26,8 +26,10 @@
#include <dirent.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <fcntl.h>
#include <unistd.h>
@ -123,10 +125,22 @@ static void f(DIR *d, unsigned int level)
int main(void)
{
DIR *d;
struct statfs sfs;
d = opendir("/proc");
if (!d)
return 4;
/* Ensure /proc is proc. */
if (fstatfs(dirfd(d), &sfs) == -1) {
return 1;
}
if (sfs.f_type != 0x9fa0) {
fprintf(stderr, "error: unexpected f_type %lx\n", (long)sfs.f_type);
return 2;
}
f(d, 0);
return 0;
}