60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* Installed as lib.start.so, this bootstraps a working busybox and uses
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* it to run lib.runshell.so. */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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void chopdir (char *s) {
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char *p=strrchr(s, '/');
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if (p == NULL) {
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fprintf(stderr, "cannot find directory in %s", s);
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exit(1);
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}
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p[0] = '\0';
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}
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main () {
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char buf[1024];
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char *p;
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struct stat st_buf;
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/* Get something like /data/data/ga.androidterm/lib/lib.start.so */
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int n=readlink("/proc/self/exe", buf, 1023);
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if (n < 1) {
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fprintf(stderr, "failed to find own name");
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exit(1);
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}
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buf[n] = '\0';
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/* Change directory to something like /data/data/ga.androidterm */
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chopdir(buf);
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chopdir(buf);
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if (chdir(buf) != 0) {
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perror("chdir");
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exit(1);
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}
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if (stat("lib/lib.busybox.so", &st_buf) != 0) {
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/* TODO my lib dir should be in LD_LIBRARY_PATH; check that */
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fprintf(stderr, "Falling back to hardcoded app location; cannot find expected files in %s\n", buf);
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if (chdir("/data/data/ga.androidterm") != 0) {
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perror("chdir");
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exit(1);
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}
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}
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/* If this is the first run, set up busybox link. */
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if (stat("busybox", &st_buf) != 0) {
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if (link("lib/lib.busybox.so", "busybox") != 0) {
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perror("link busybox");
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exit(1);
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}
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}
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execl("./busybox", "./busybox", "sh", "lib/lib.runshell.so", NULL);
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perror("error running busybox sh");
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}
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