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55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* radare - LGPL - Copyright 2009-2013 - pancake */
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#include <r_cons.h>
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#include <unistd.h>
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#include <limits.h>
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//TODO: cons_pipe should be using a stack pipe_push, pipe_pop
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/* this is the base fd.. more than one is supported :) */
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static int backup_fd = -1;
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static int backup_fdn = 1;
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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R_API int r_cons_pipe_open(const char *file, int fdn, int append) {
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if (fdn < 1) {
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return -1;
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}
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int fd = r_sandbox_open (file,
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O_BINARY | O_RDWR | O_CREAT | (append? O_APPEND: O_TRUNC), 0644);
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if (fd==-1) {
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eprintf ("r_cons_pipe_open: Cannot open file '%s'\n", file);
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return -1;
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}// else eprintf ("%s created\n", file);
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if (backup_fd != -1)
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close (backup_fd);
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backup_fdn = (fdn>0)? fdn: 1;
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#if __WINDOWS__ && !__CYGWIN__
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backup_fd = 2002-(fd-2); // windows xp has 2048 as limit fd
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if (_dup2 (fdn, backup_fd) == -1) {
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#else
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backup_fd = sysconf (_SC_OPEN_MAX)-(fd-2); // portable getdtablesize()
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if (backup_fd <2) backup_fd = 2002-(fd-2); // fallback
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if (dup2 (fdn, backup_fd) == -1) {
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#endif
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eprintf ("Cannot dup stdout to %d\n", backup_fd);
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return -1;
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}
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close (fdn);
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dup2 (fd, fdn);
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return fd;
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}
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R_API void r_cons_pipe_close(int fd) {
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if (fd == -1)
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return;
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close (fd);
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if (backup_fd != -1) {
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dup2 (backup_fd, backup_fdn);
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close (backup_fd);
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backup_fd = -1;
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}
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}
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