1/* vi: set sw=4 ts=4: */ 2/* 3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 4 */ 5 6#include "libbb.h" 7#include "unarchive.h" 8 9/* transformer(), more than meets the eye */ 10/* 11 * On MMU machine, the transform_prog is removed by macro magic 12 * in include/unarchive.h. On NOMMU, transformer is removed. 13 */ 14void FAST_FUNC open_transformer(int fd, 15 IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd), 16 const char *transform_prog) 17{ 18 struct fd_pair fd_pipe; 19 int pid; 20 21 xpiped_pair(fd_pipe); 22 pid = BB_MMU ? xfork() : xvfork(); 23 if (pid == 0) { 24 /* Child */ 25 close(fd_pipe.rd); /* we don't want to read from the parent */ 26 // FIXME: error check? 27#if BB_MMU 28 transformer(fd, fd_pipe.wr); 29 if (ENABLE_FEATURE_CLEAN_UP) { 30 close(fd_pipe.wr); /* send EOF */ 31 close(fd); 32 } 33 /* must be _exit! bug was actually seen here */ 34 _exit(EXIT_SUCCESS); 35#else 36 { 37 char *argv[4]; 38 xmove_fd(fd, 0); 39 xmove_fd(fd_pipe.wr, 1); 40 argv[0] = (char*)transform_prog; 41 argv[1] = (char*)"-cf"; 42 argv[2] = (char*)"-"; 43 argv[3] = NULL; 44 BB_EXECVP(transform_prog, argv); 45 bb_perror_msg_and_die("can't execute '%s'", transform_prog); 46 } 47#endif 48 /* notreached */ 49 } 50 51 /* parent process */ 52 close(fd_pipe.wr); /* don't want to write to the child */ 53 xmove_fd(fd_pipe.rd, fd); 54} 55