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