jehanne/qa/kern/sysstatread.c

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#include <u.h>
#include <lib9.h>
// Change-Id: I1cfd642d29a3955499b3507f56f0449d1710700e
// sys/src/nxm/port/devcons.c:
// make reads on #c/sysstat return only as many bytes as
// requested
void
main(void)
{
int ret; // 0 = pass, 1 = fail
int fd, n;
char buf[1];
fd = open("/dev/sysstat", OREAD);
if(fd < 0){
print("FAIL: couldn't open /dev/sysstat: %r\n");
exits("FAIL");
}
ret = 0;
for(;;){
n = read(fd, buf, sizeof(buf));
if(n <= 0)
break;
if(n > sizeof(buf))
ret = 1;
}
close(fd);
if(ret){
print("FAIL: %d bytes read from /dev/sysstat\n", n);
exits("FAIL");
}
print("PASS\n");
exits("PASS");
}