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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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4 | */
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5 |
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6 | #include "libbb.h"
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7 | #include "unarchive.h"
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8 |
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9 | /* transformer(), more than meets the eye */
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10 | /*
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11 | * On MMU machine, the transform_prog and ... are stripped
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12 | * by a macro in include/unarchive.h. On NOMMU, transformer is stripped.
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13 | */
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14 | int open_transformer(int src_fd,
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15 | USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
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16 | const char *transform_prog, ...)
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17 | {
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18 | int fd_pipe[2];
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19 | int pid;
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20 |
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21 | xpipe(fd_pipe);
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22 |
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23 | #if BB_MMU
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24 | pid = fork();
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25 | #else
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26 | pid = vfork();
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27 | #endif
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28 | if (pid == -1)
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29 | bb_perror_msg_and_die("fork failed");
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30 |
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31 | if (pid == 0) {
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32 | #if !BB_MMU
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33 | va_list ap;
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34 | #endif
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35 | /* child process */
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36 | close(fd_pipe[0]); /* We don't wan't to read from the parent */
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37 | // FIXME: error check?
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38 | #if BB_MMU
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39 | transformer(src_fd, fd_pipe[1]);
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40 | if (ENABLE_FEATURE_CLEAN_UP) {
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41 | close(fd_pipe[1]); /* Send EOF */
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42 | close(src_fd);
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43 | }
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44 | exit(0);
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45 | #else
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46 | xmove_fd(src_fd, 0);
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47 | xmove_fd(fd_pipe[1], 1);
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48 | va_start(ap, transform_prog);
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49 | BB_EXECVP(transform_prog, ap);
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50 | bb_perror_and_die("exec failed");
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51 | #endif
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52 | /* notreached */
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53 | }
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54 |
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55 | /* parent process */
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56 | close(fd_pipe[1]); /* Don't want to write to the child */
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57 |
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58 | return fd_pipe[0];
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59 | }
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