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// RUN: %clangxx -g %s -o %t && %run %t
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv) {
FILE *fp = fopen(argv[0], "r");
assert(fp);
// file should be good upon opening
assert(!feof(fp) && !ferror(fp));
// read until EOF
char buf[BUFSIZ];
while (fread(buf, 1, sizeof buf, fp) != 0) {}
assert(feof(fp));
// clear EOF
clearerr(fp);
assert(!feof(fp) && !ferror(fp));
// get file descriptor
int fd = fileno(fp);
assert(fd != -1);
// break the file by closing underlying descriptor
assert(close(fd) != -1);
// verify that an error is signalled
assert(fread(buf, 1, sizeof buf, fp) == 0);
assert(ferror(fp));
// clear error
clearerr(fp);
assert(!feof(fp) && !ferror(fp));
// fclose() will return EBADF because of closed fd
assert(fclose(fp) == -1);
return 0;
}
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