Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/master/dup2-array.c @ 8971:163c3f85a3aa HEAD

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author Timo Sirainen <tss@iki.fi>
date Mon, 20 Apr 2009 13:28:00 -0400
parents b9faf4db2a9f
children 00cd9aacd03c
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rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
Timo Sirainen <tss@iki.fi>
parents: 7086
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1 /* Copyright (c) 2007-2009 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "array.h"
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5 #include "fd-close-on-exec.h"
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6 #include "dup2-array.h"
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7
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8 #include <unistd.h>
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9
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10 void dup2_append(ARRAY_TYPE(dup2) *dups, int fd_src, int fd_dest)
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11 {
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12 struct dup2 d;
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13
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14 d.fd_src = fd_src;
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15 d.fd_dest = fd_dest;
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16 array_append(dups, &d, 1);
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17 }
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18
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19 int dup2_array(ARRAY_TYPE(dup2) *dups_arr)
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20 {
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21 struct dup2 *dups;
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22 bool *moved, moves;
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23 unsigned int i, j, count, conflict;
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24 int fd;
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25
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26 dups = array_get_modifiable(dups_arr, &count);
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27
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28 moved = t_new(bool, count);
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29 for (;;) {
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30 conflict = count;
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31 moves = FALSE;
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32 for (i = 0; i < count; i++) {
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33 if (moved[i])
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34 continue;
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35
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36 for (j = 0; j < count; j++) {
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37 if (dups[j].fd_src == dups[i].fd_dest &&
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38 !moved[j]) {
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39 conflict = j;
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40 break;
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41 }
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42 }
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43
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44 if (j == count) {
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45 /* no conflicts, move it */
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46 moved[i] = TRUE;
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47 moves = TRUE;
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48 if (dup2(dups[i].fd_src, dups[i].fd_dest) < 0) {
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49 i_error("dup2(%d, %d) failed: %m",
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50 dups[i].fd_src,
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51 dups[i].fd_dest);
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52 return -1;
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53 }
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54 }
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55 }
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56 if (conflict == count)
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57 break;
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58
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59 if (moves) {
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60 /* it's possible that the conflicting fd was
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61 moved already. try again. */
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62 continue;
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63 }
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64
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65 /* ok, we have to dup() */
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66 fd = dup(dups[conflict].fd_src);
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67 if (fd == -1) {
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68 i_error("dup(%d) failed: %m", dups[conflict].fd_src);
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69 return -1;
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70 }
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71 fd_close_on_exec(fd, TRUE);
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72 dups[conflict].fd_src = fd;
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73 }
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74 return 0;
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75 }
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76