mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-15 16:19:24 +00:00
fd03461a93
* configure.ac: Call AC_REPLACE_FUNCS on ffsll. * gold.h (ffsll): Declare if HAVE_FFSLL is not defined. * ftruncate.c (ftruncate): Declare before definition. * mremap.c (mremap): Likewise. * pread.c (pread): Likewise. * configure, Makefile.in, config.in: Rebuild.
93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
/* ftruncate emulations that work on some System V's.
|
|
This file is in the public domain. */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
|
|
extern int ftruncate (int, off_t);
|
|
|
|
#ifdef F_CHSIZE
|
|
|
|
int
|
|
ftruncate (int fd, off_t length)
|
|
{
|
|
return fcntl (fd, F_CHSIZE, length);
|
|
}
|
|
|
|
#else /* not F_CHSIZE */
|
|
# ifdef F_FREESP
|
|
|
|
/* By William Kucharski <kucharsk@netcom.com>. */
|
|
|
|
# include <sys/stat.h>
|
|
# include <errno.h>
|
|
|
|
int
|
|
ftruncate (int fd, off_t length)
|
|
{
|
|
struct flock fl;
|
|
struct stat filebuf;
|
|
|
|
if (fstat (fd, &filebuf) < 0)
|
|
return -1;
|
|
|
|
if (filebuf.st_size < length)
|
|
{
|
|
/* Extend file length. */
|
|
if (lseek (fd, (length - 1), SEEK_SET) < 0)
|
|
return -1;
|
|
|
|
/* Write a "0" byte. */
|
|
if (write (fd, "", 1) != 1)
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
|
|
/* Truncate length. */
|
|
|
|
fl.l_whence = 0;
|
|
fl.l_len = 0;
|
|
fl.l_start = length;
|
|
fl.l_type = F_WRLCK; /* write lock on file space */
|
|
|
|
/* This relies on the *undocumented* F_FREESP argument to fcntl,
|
|
which truncates the file so that it ends at the position
|
|
indicated by fl.l_start. Will minor miracles never cease? */
|
|
|
|
if (fcntl (fd, F_FREESP, &fl) < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
# else /* not F_CHSIZE nor F_FREESP */
|
|
# if HAVE_CHSIZE /* native Windows, e.g. mingw */
|
|
|
|
int
|
|
ftruncate (int fd, off_t length)
|
|
{
|
|
return chsize (fd, length);
|
|
}
|
|
|
|
# else /* not F_CHSIZE nor F_FREESP nor HAVE_CHSIZE */
|
|
|
|
# include <errno.h>
|
|
|
|
int
|
|
ftruncate (int fd, off_t length)
|
|
{
|
|
errno = EIO;
|
|
return -1;
|
|
}
|
|
|
|
# endif /* not HAVE_CHSIZE */
|
|
# endif /* not F_FREESP */
|
|
#endif /* not F_CHSIZE */
|