diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/pread.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/pread.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/pread.c b/sysdeps/unix/sysv/linux/pread.c index eeb26eb663..eb0d301fa1 100644 --- a/sysdeps/unix/sysv/linux/pread.c +++ b/sysdeps/unix/sysv/linux/pread.c @@ -17,12 +17,36 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <errno.h> #include <unistd.h> +extern ssize_t __syscall_pread64 (int fd, void *buf, size_t count, + off_t offset_hi, off_t offset_lo); + +static ssize_t __emulate_pread (int fd, void *buf, size_t count, + off_t offset) internal_function; + + ssize_t -__pread (int fd, void *buf, size_t nbytes, off_t offset) +__pread (fd, buf, count, offset) + int fd; + void *buf; + size_t count; + off_t offset; { - return __pread64 (fd, buf, nbytes, (off64_t) offset); + ssize_t result; + + /* First try the syscall. */ + result = __syscall_pread64 (fd, buf, count, 0, offset); + if (result == -1 && errno == ENOSYS) + /* No system call available. Use the emulation. */ + result = __emulate_pread (fd, buf, count, offset); + + return result; } weak_alias (__pread, pread) + +#define __pread(fd, buf, count, offset) \ + static internal_function __emulate_pread (fd, buf, count, offset) +#include <sysdeps/posix/pread.c> |