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// RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s
// CHECK: 1
// CHECK-NEXT: 2
#include <assert.h>
#include <stdio.h>
int main(void) {
// use a tool that produces different output than input to verify
// that everything worked correctly
FILE *fp = popen("sort", "w");
assert(fp);
// verify that fileno() returns a meaningful descriptor (needed
// for the implementation of TSan)
assert(fileno(fp) != -1);
assert(fputs("2\n", fp) >= 0);
assert(fputs("1\n", fp) >= 0);
assert(pclose(fp) == 0);
return 0;
}
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