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/* See LICENSE file for copyright and license details. */
#ifndef FORTIFY_UNISTD_H_
#define FORTIFY_UNISTD_H_
#include_next <unistd.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#define __errordecl(name, msg) extern void name(void) __attribute__ ((__error__(msg)))
__errordecl(__pread_error, "pread: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
__fortify_pread(int fd, void *buf, size_t n, off_t offset)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(n) && n > bos)
__pread_error();
if (n > bos)
__builtin_trap();
return pread(fd, buf, n, offset);
}
__errordecl(__read_error, "read: buffer overflow detected");
static inline __attribute__ ((always_inline))
ssize_t
__fortify_read(int fd, void *buf, size_t n)
{
size_t bos = __builtin_object_size(buf, 0);
if (__builtin_constant_p(n) && n > bos)
__read_error();
if (n > bos)
__builtin_trap();
return read(fd, buf, n);
}
#undef pread
#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
#undef read
#define read(fd, buf, n) __fortify_read(fd, buf, n)
#undef __errordecl
#endif
#endif
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