Part C code:
ioctl(fd, USBDEVFS_CLAIMINTERFACE, 0);
perror("ioctl");
ret = ioctl(fd, USBDEVFS_BULK, &bulk);
perror("ioctl");
this is the result:
ioctl: Bad address
ioctl: Device or resource busy
#lsusb
Bus 002 Device 003: ID 0000:0000
Syslog:
kernel: usb 2-2: usbfs: process 6073 (prueba3) did not claim interface
0 before use
#strace ./prueba3
execve("./prueba3", ["./prueba3"], [/* 29 vars */]) = 0
uname({sys="Linux", node="jupiter", ...}) = 0
brk(0) = 0x804a000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x40017000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=78440, ...}) = 0
old_mmap(NULL, 78440, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/libusb-0.1.so.4", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260\24"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=28788, ...}) = 0
old_mmap(NULL, 31864, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002c000
old_mmap(0x40032000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED, 3, 0x5000) = 0x40032000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`Z\1\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1254468, ...}) = 0
old_mmap(NULL, 1264780, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40034000
old_mmap(0x4015e000, 36864, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED, 3, 0x129000) = 0x4015e000
old_mmap(0x40167000, 7308, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40167000
close(3) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x40169000
set_thread_area({entry_number:-1 -> 6, base_addr:0x40169460,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0x40018000, 78440) = 0
open("/proc/bus/usb/002/003", O_RDWR) = 3
ioctl(3, USBDEVFS_CLAIMINTERFACE, 0) = -1 EFAULT (Bad address)
dup(2) = 4
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
brk(0) = 0x804a000
brk(0x806b000) = 0x806b000
brk(0) = 0x806b000
fstat64(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40018000
_llseek(4, 0, 0xbffff798, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(4, "ioctl: Bad address\n", 19ioctl: Bad address
) = 19
close(4) = 0
munmap(0x40018000, 4096) = 0
ioctl(3, UI_DEV_DESTROY or USBDEVFS_BULK, 0xbffff930) = -1 EBUSY
(Device or resource busy)
dup(2) = 4
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40018000
_llseek(4, 0, 0xbffff798, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(4, "ioctl: Device or resource busy\n", 31ioctl: Device or resource busy
) = 31
close(4) = 0
munmap(0x40018000, 4096) = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40018000
write(1, "Error in bulk transfer\n", 23Error in bulk transfer
) = 23
close(3) = 0
munmap(0x40018000, 4096) = 0
exit_group(0) = ?
where prueba3 is my file.
Thank you
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