compiler-rt/test/sanitizer_common/TestCases/Linux/preadv2.cpp

   1 // RUN: %clangxx -O0 %s -o %t
   2
   3 // REQUIRES: glibc
   4
   5 #include <assert.h>
   6 #include <fcntl.h>
   7 #include <sys/uio.h>
   8 #include <unistd.h>
   9
  10 #if !defined(__GLIBC_PREREQ)
  11 #define __GLIBC_PREREQ(a, b) 0
  12 #endif
  13
  14 #if !__GLIBC_PREREQ(2, 26)
  15 #define preadv2(a, b, c, d, e) preadv(a, b, c, d)
  16 #endif
  17
  18 int main(void) {
  19   int fd = open("/proc/self/stat", O_RDONLY);
  20   char bufa[7];
  21   char bufb[7];
  22   struct iovec vec[2];
  23   vec[0].iov_base = bufa + 4;
  24   vec[0].iov_len = 1;
  25   vec[1].iov_base = bufb;
  26   vec[1].iov_len = sizeof(bufb);
  27   ssize_t rd = preadv2(fd, vec, 2, 0, 0);
  28   assert(rd > 0);
  29   vec[0].iov_base = bufa;
  30   rd = preadv2(fd, vec, 2, 0, 0);
  31   assert(rd > 0);
  32   rd = preadv2(fd, vec, 5, -25, 0);
  33   assert(rd < 0);
  34   close(fd);
  35   return 0;
  36 }