diff options
Diffstat (limited to 'libc/sysdeps/linux/common')
| -rw-r--r-- | libc/sysdeps/linux/common/Makefile | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/common/ftruncate64.c | 39 |
2 files changed, 40 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/Makefile b/libc/sysdeps/linux/common/Makefile index 48214189e..af7f5bf01 100644 --- a/libc/sysdeps/linux/common/Makefile +++ b/libc/sysdeps/linux/common/Makefile @@ -32,7 +32,7 @@ endif CSRC= waitpid.c kernel_version.c statfix.c getdnnm.c gethstnm.c \ mkfifo.c setegid.c wait.c getpagesize.c seteuid.c \ wait3.c setpgrp.c getdtablesize.c create_module.c ptrace.c \ - cmsg_nxthdr.c open64.c statfix64.c longjmp.c \ + cmsg_nxthdr.c open64.c statfix64.c longjmp.c ftruncate64.c \ getrlimit64.c setrlimit64.c ifneq ($(strip $(EXCLUDE_BRK)),true) CSRC+=sbrk.c diff --git a/libc/sysdeps/linux/common/ftruncate64.c b/libc/sysdeps/linux/common/ftruncate64.c new file mode 100644 index 000000000..0b87eb58a --- /dev/null +++ b/libc/sysdeps/linux/common/ftruncate64.c @@ -0,0 +1,39 @@ +/* + * ftruncate64 syscall. Copes with 64 bit and 32 bit machines + * and on 32 bit machines this sends things into the kernel as + * two 32-bit arguments (high and low 32 bits of length) that + * are ordered based on endianess. It turns out endian.h has + * just the macro we need to order things (__LONG_LONG_PAIR). + * + * Copyright (C) 2002 Erik Andersen <andersen@codepoet.org> + * + * This file is subject to the terms and conditions of the GNU + * Lesser General Public License. See the file COPYING.LIB in + * the main directory of this archive for more details. + */ + +#include <features.h> +#include <unistd.h> +#include <errno.h> +#include <endian.h> +#include <stdint.h> +#include <sys/syscall.h> + +#if defined __UCLIBC_HAVE_LFS__ && defined __NR_ftruncate64 +#if (__WORDSIZE == 64) +/* For a 64 bit machine, life is simple... */ +_syscall2(int, ftruncate64, int, fd, __off64_t, length); +#elif (__WORDSIZE == 32) +#define __NR___ftruncate64 __NR_ftruncate64 +static inline _syscall3(int, __ftruncate64, int, fd, int, high_length, int, low_length); +/* The exported ftruncate64 function. */ +int ftruncate64 (int fd, __off64_t length) +{ + unsigned int low = length & 0xffffffff; + unsigned int high = length >> 32; + return __ftruncate64(fd, __LONG_LONG_PAIR (high, low)); +} +#else +#error Your machine is not 64 bit or 32 bit, I am dazed and confused. +#endif +#endif /* __UCLIBC_HAVE_LFS__ */ |