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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Truncate a file given by name. Generic POSIX.1 version.
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Copyright (C) 1995-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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/* Truncate PATH to LENGTH bytes. */
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int
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__truncate (const char *path, off_t length)
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{
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int fd, ret, save;
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fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0));
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if (fd < 0)
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return -1;
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if (length == 0)
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ret = 0;
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else
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ret = __ftruncate (fd, length);
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save = errno;
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(void) __close (fd);
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if (ret < 0)
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__set_errno (save);
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return ret;
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}
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weak_alias (__truncate, truncate)
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