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Clean up POSIX.1 implementation of truncate.

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Roland McGrath
2013-05-06 14:56:13 -07:00
parent 9ea3513c91
commit c74058300c
2 changed files with 17 additions and 7 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2013-05-06 Roland McGrath <roland@hack.frob.com>
* sysdeps/posix/truncate.c (__truncate): Renamed from truncate.
Call __ names for open, ftruncate, and close.
For LENGTH==0 case, just use O_TRUNC rather than calling ftruncate.
(truncate): Define as weak alias.
2013-05-06 Joseph Myers <joseph@codesourcery.com> 2013-05-06 Joseph Myers <joseph@codesourcery.com>
* math/gen-libm-test.pl (parse_args): Initialize x before each * math/gen-libm-test.pl (parse_args): Initialize x before each

17
sysdeps/posix/truncate.c
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@ -1,4 +1,5 @@
/* Copyright (C) 1995-2013 Free Software Foundation, Inc. /* Truncate a file given by name. Generic POSIX.1 version.
Copyright (C) 1995-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -22,20 +23,22 @@
/* Truncate PATH to LENGTH bytes. */ /* Truncate PATH to LENGTH bytes. */
int int
truncate (path, length) __truncate (const char *path, off_t length)
const char *path;
off_t length;
{ {
int fd, ret, save; int fd, ret, save;
fd = open (path, O_WRONLY); fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0));
if (fd < 0) if (fd < 0)
return -1; return -1;
ret = ftruncate (fd, length); if (length == 0)
ret = 0;
else
ret = __ftruncate (fd, length);
save = errno; save = errno;
(void) close (fd); (void) __close (fd);
if (ret < 0) if (ret < 0)
__set_errno (save); __set_errno (save);
return ret; return ret;
} }
weak_alias (__truncate, truncate)