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