clang/test/Analysis/global-region-invalidation-errno.c

   1 // RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -disable-free -verify %s \
   2 // RUN:   -analyzer-checker=core,deadcode,alpha.security.taint \
   3 // RUN:   -DERRNO_VAR
   4
   5 // RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -disable-free -verify %s \
   6 // RUN:   -analyzer-checker=core,deadcode,alpha.security.taint \
   7 // RUN:   -DERRNO_FUNC
   8
   9 // Note, we do need to include headers here, since the analyzer checks if the function declaration is located in a system header.
  10 // The errno value can be defined in multiple ways, test with each one.
  11 #ifdef ERRNO_VAR
  12 #include "Inputs/errno_var.h"
  13 #endif
  14 #ifdef ERRNO_FUNC
  15 #include "Inputs/errno_func.h"
  16 #endif
  17 #include "Inputs/system-header-simulator.h"
  18
  19
  20 void foo(void);
  21
  22 // expected-no-diagnostics
  23
  24 // Test errno gets invalidated by a system call.
  25 int testErrnoSystem(void) {
  26   int i;
  27   int *p = 0;
  28   fscanf(stdin, "%d", &i);
  29   if (errno == 0) {
  30     fscanf(stdin, "%d", &i); // errno gets invalidated here.
  31     return 5 / errno; // no-warning
  32   }
  33
  34   errno = 0;
  35   fscanf(stdin, "%d", &i); // errno gets invalidated here.
  36   return 5 / errno; // no-warning
  37 }
  38
  39 // Test that errno gets invalidated by internal calls.
  40 int testErrnoInternal(void) {
  41   int i;
  42   int *p = 0;
  43   fscanf(stdin, "%d", &i);
  44   if (errno == 0) {
  45     foo(); // errno gets invalidated here.
  46     return 5 / errno; // no-warning
  47   }
  48   return 0;
  49 }