Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/file-set-size.c @ 6622:d6cc55e018fe HEAD

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Solaris compile fix.
author Timo Sirainen <tss@iki.fi>
date Sat, 27 Oct 2007 19:02:07 +0300
parents a9dfe05dfadd
children dde1980eccae
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65c69a53a7be Replaced my Copyright notices. The year range always ends with 2007 now.
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1 /* Copyright (c) 2002-2007 Dovecot authors, see the included COPYING file */
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2
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3 #ifdef HAVE_POSIX_FALLOCATE
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4 # define _XOPEN_SOURCE 600 /* Required by glibc, breaks Solaris 9 */
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5 #endif
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6 #include "lib.h"
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7 #include "file-set-size.h"
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8
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9 #include <unistd.h>
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10 #include <fcntl.h>
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11 #include <sys/stat.h>
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12
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13 int file_set_size(int fd, off_t size)
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14 {
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15 #ifdef HAVE_POSIX_FALLOCATE
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16 static bool posix_fallocate_supported = TRUE;
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17 #endif
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18 char block[4096];
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19 off_t offset;
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20 ssize_t ret;
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21 struct stat st;
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23 i_assert(size >= 0);
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24
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25 if (fstat(fd, &st) < 0) {
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26 i_error("fstat() failed: %m");
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27 return -1;
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28 }
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29
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30 if (size < st.st_size) {
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31 if (ftruncate(fd, size) < 0) {
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32 i_error("ftruncate() failed: %m");
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33 return -1;
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34 }
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35 return 0;
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36 }
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37 if (size == st.st_size)
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38 return 0;
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39
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40 #ifdef HAVE_POSIX_FALLOCATE
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41 if (posix_fallocate_supported) {
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42 if (posix_fallocate(fd, st.st_size, size - st.st_size) == 0)
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43 return 0;
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44
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45 if (errno != EINVAL) {
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46 if (!ENOSPACE(errno))
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47 i_error("posix_fallocate() failed: %m");
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48 return -1;
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49 }
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50 /* Solaris seems to fail with EINVAL if it's not supported
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51 by the kernel. Fallback to writing. */
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52 posix_fallocate_supported = FALSE;
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53 }
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54 #endif
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55 /* start growing the file */
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56 offset = st.st_size;
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57 memset(block, 0, I_MIN((ssize_t)sizeof(block), size - offset));
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58
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59 while (offset < size) {
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60 ret = pwrite(fd, block,
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61 I_MIN((ssize_t)sizeof(block), size - offset),
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62 offset);
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63 if (ret < 0) {
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64 if (!ENOSPACE(errno))
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65 i_error("pwrite() failed: %m");
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66 return -1;
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67 }
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68 offset += size;
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69 }
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70 return 0;
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71 }