minix/lib/libc/sys-minix/ftruncate.c

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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <minix/u64.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(ftruncate, _ftruncate)
#endif
static int __ftruncate_321(int _fd, int _length);
static int __ftruncate_321(int _fd, int _length)
{
message m;
m.m2_l1 = _length;
m.m2_i1 = _fd;
return(_syscall(VFS_PROC_NR, FTRUNCATE_321, &m));
}
int ftruncate(int _fd, off_t _length)
{
message m;
int orig_errno, r;
m.m2_l1 = ex64lo(_length);
m.m2_l2 = ex64hi(_length);
m.m2_i1 = _fd;
orig_errno = errno;
r = _syscall(VFS_PROC_NR, FTRUNCATE, &m);
if (r == -1 && errno == ENOSYS) {
/* Old VFS, no support for new ftruncate */
if (_length >= INT_MIN && _length <= INT_MAX) {
errno = orig_errno;
return __ftruncate_321(_fd, (int) _length);
}
/* Not going to fit */
errno = EOVERFLOW;
}
return r;
}