I am all of a sudden getting ETXTBSY error executing a binary and reading some details on internet I found that reason could be:
I am trying to execute an ELF corresponding to the C program whose text is shown below. But above thing is not convincing - who can be writing to my file which is afterall a binary.This occurs when you try and write to a file that is currently being executed by the kernel, or execute a file that is currently open for writing.
This binary sends some ioctl to a driver which has hooked read system call. please give me any pointers.
strace:
root@manoj-desktop:~/kdev/lockit/cmd/src# strace ./lockcode:
execve("./lock", ["./lock"], [/* 37 vars */]) = -1 ETXTBSY (Text file busy)
dup(2) = 3
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fcd000
_llseek(3, 0, 0xbf817884, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "strace: exec: Text file busy\n", 29strace: exec: Text file busy
) = 29
close(3) = 0
munmap(0xb7fcd000, 4096) = 0
exit_group(1) = ?
Process 5119 detached
...
if(!strcmp(argv[1], "add")) {
filename = argv[2];
assert(filename != NULL);
rc = lstat(filename, &buf);
if(-1 == rc) {
printf("Failed while stating the file\n");
_exit(1);
}
msg->ino = buf.st_ino;
if(ioctl(fd, LOCKIT_MSG_ADD_FILE, msg) == -1) {
printf("ioctl to driver failed while adding file."
" errno [%d]\n", errno);
_exit(LOCKIT_ERR_DRV_IOCTL_FAILED);
}
printf("Successfully added %s to the Lockit DB\n",
argv[2]);
...
TIA,
-Manoj
--
What is important? What you want to be true, or what is true?
---------------------------------------------------------------------------
http://awmanoj.blogspot.com
