On 26.05.2020 21:51, Sid Spry wrote: > On Wed, May 20, 2020, at 11:22 AM, Sid Spry wrote: >> Crossreffing >> https://protect2.fireeye.com/url?k=c219aa9a-9fcaf18e-c21821d5-0cc47a31ce4e-c3654d6c375cfe09&q=1&u=https%3A%2F%2Fgithub.com%2Ftorvalds%2Flinux%2Fblob%2F2f4c53349961c8ca480193e47da4d44fdb8335a8%2Ftools%2Fusb%2Fffs-test.c it looks like all I have to do is open "ep0" in the proper directory, but I do just that and it fails on first and subsequent runs. >> >> gadget.cc: >> >> ``` >> #include <stdio.h> >> #include <stdlib.h> >> #include <unistd.h> >> #include <fcntl.h> >> #include <string.h> >> #include <errno.h> >> >> #include <linux/usb/ch9.h> >> #include <usbg/usbg.h> >> >> #define VENDOR 0x1d6b >> #define PRODUCT 0x0104 >> >> int usbg_setup( >> usbg_state **s, >> usbg_gadget **g, >> usbg_config **c, >> usbg_function **f_ffs0, >> usbg_function **f_ncm0 >> ); >> >> int main(int argc, char *argv[]) { >> usbg_state *s; >> usbg_gadget *g; >> usbg_config *c; >> usbg_function *f_ffs0, *f_ncm0; >> >> if (int rc = usbg_setup(&s, &g, &c, &f_ffs0, &f_ncm0); >> rc != 0) { >> puts("gadget exists or libcomposite needs to be loaded."); >> } else { >> puts("gadget created."); >> } >> >> int ffs_fd = open("/sys/kernel/config/usb_gadget/g1/functions/ffs.dev0", >> O_RDONLY); >> if (int rc = fchdir(ffs_fd); rc != 0) { >> fprintf(stderr, "unable to chdir to ffs directory: %s\n", >> strerror(errno)); >> } >> >> int ffs_fd_ep0 = open("ep0", >> O_RDWR); >> if (ffs_fd_ep0 < 0) { >> fprintf(stderr, "unable to create ep0: %d : %s\n", >> errno, strerror(errno)); >> } >> >> close(ffs_fd); >> } >> >> int usbg_setup( >> usbg_state **s, >> usbg_gadget **g, >> usbg_config **c, >> usbg_function **f_ffs0, >> usbg_function **f_ncm0 >> ) { >> struct usbg_gadget_attrs g_attrs = { >> .bcdUSB = 0x0200, >> .bDeviceClass = USB_CLASS_PER_INTERFACE, >> .bDeviceSubClass = 0x00, >> .bDeviceProtocol = 0x00, >> .bMaxPacketSize0 = 64, >> .idVendor = VENDOR, >> .idProduct = PRODUCT, >> .bcdDevice = 0x0000 >> }; >> >> struct usbg_gadget_strs g_strs = { >> .manufacturer = "Foo Inc.", >> .product = "Bar Gadget", >> .serial = "0000000000" >> }; >> >> struct usbg_config_strs c_strs = { >> .configuration = "Default" >> }; >> >> if (usbg_error rc = >> (usbg_error)usbg_init("/sys/kernel/config", s); >> rc != USBG_SUCCESS) { >> goto error_exit; >> } >> >> if (usbg_error rc = >> (usbg_error)usbg_create_gadget(*s, "g1", >> &g_attrs, &g_strs, g); >> rc != USBG_SUCCESS) { >> goto error_exit; >> } >> >> if (usbg_error rc = >> (usbg_error)usbg_create_function(*g, >> USBG_F_NCM, "dev0", NULL, f_ncm0); >> rc != USBG_SUCCESS) { >> goto error_exit; >> } >> >> if (usbg_error rc = >> (usbg_error)usbg_create_function(*g, >> USBG_F_FFS, "dev0", NULL, f_ffs0); >> rc != USBG_SUCCESS) { >> //fprintf(stderr, "Error: %s : %s\n", usbg_error_name(rc), >> // usbg_strerror(rc)); >> goto error_exit; >> } >> >> return 0; >> >> error_exit: >> return -2; >> } >> ``` >> >> strace: >> >> ``` >> execve("./gadget", ["./gadget"], 0xbece77a0 /* 19 vars */) = 0 >> brk(NULL) = 0x1017000 >> uname({sysname="Linux", nodename="nanopiduo", ...}) = 0 >> mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, >> 0) = 0xb6f5e000 >> access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or >> directory) >> openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=35157, ...}) = 0 >> mmap2(NULL, 35157, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb6f55000 >> close(3) = 0 >> openat(AT_FDCWD, "/usr/local/lib/libusbgx.so.2", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\314I\0\0004\0\0\0"..., >> 512) = 512 >> _llseek(3, 362460, [362460], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1400) = 1400 >> _llseek(3, 50996, [50996], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 362460, [362460], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1400) = 1400 >> _llseek(3, 50996, [50996], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 362460, [362460], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1400) = 1400 >> _llseek(3, 50996, [50996], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 362460, [362460], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1400) = 1400 >> _llseek(3, 50996, [50996], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 362460, [362460], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1400) = 1400 >> _llseek(3, 50996, [50996], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> fstat64(3, {st_mode=S_IFREG|0755, st_size=363860, ...}) = 0 >> mmap2(NULL, 116508, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6f1b000 >> mprotect(0xb6f27000, 61440, PROT_NONE) = 0 >> mmap2(0xb6f36000, 8192, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb000) = 0xb6f36000 >> close(3) = 0 >> openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libconfig.so.9", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\360\"\0\0004\0\0\0"..., >> 512) = 512 >> _llseek(3, 29420, [29420], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 960) = 960 >> _llseek(3, 29096, [29096], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 29420, [29420], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 960) = 960 >> _llseek(3, 29096, [29096], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 29420, [29420], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 960) = 960 >> _llseek(3, 29096, [29096], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 29420, [29420], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 960) = 960 >> _llseek(3, 29096, [29096], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 29420, [29420], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 960) = 960 >> _llseek(3, 29096, [29096], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=30380, ...}) = 0 >> mmap2(NULL, 94636, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6f03000 >> mprotect(0xb6f0a000, 61440, PROT_NONE) = 0 >> mmap2(0xb6f19000, 8192, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0xb6f19000 >> close(3) = 0 >> openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libstdc++.so.6", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\270\346\6\0004\0\0\0"..., 512) = 512 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> _llseek(3, 1018532, [1018532], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1240) = 1240 >> _llseek(3, 1017936, [1017936], SEEK_SET) = 0 >> read(3, "A2\0\0\0aeabi\0\1(\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 51) = 51 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=1019772, ...}) = 0 >> mmap2(NULL, 1091308, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6df8000 >> mprotect(0xb6eeb000, 61440, PROT_NONE) = 0 >> mmap2(0xb6efa000, 28672, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf2000) = 0xb6efa000 >> mmap2(0xb6f01000, 5868, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6f01000 >> close(3) = 0 >> openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libm.so.6", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\250r\0\0004\0\0\0"..., >> 512) = 512 >> _llseek(3, 434644, [434644], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 434288, [434288], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 53) = 53 >> _llseek(3, 434644, [434644], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 434288, [434288], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 53) = 53 >> _llseek(3, 434644, [434644], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 434288, [434288], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 53) = 53 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=435724, ...}) = 0 >> mmap2(NULL, 499832, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6d7d000 >> mprotect(0xb6de7000, 61440, PROT_NONE) = 0 >> mmap2(0xb6df6000, 8192, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x69000) = 0xb6df6000 >> close(3) = 0 >> openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libgcc_s.so.1", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\360\321\0\0004\0\0\0"..., 512) = 512 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> _llseek(3, 98916, [98916], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 1080) = 1080 >> _llseek(3, 98556, [98556], SEEK_SET) = 0 >> read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\4\22"..., >> 49) = 49 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=99996, ...}) = 0 >> mmap2(NULL, 164148, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6d54000 >> mprotect(0xb6d6c000, 61440, PROT_NONE) = 0 >> mmap2(0xb6d7b000, 8192, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0xb6d7b000 >> close(3) = 0 >> openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libc.so.6", >> O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3 >> read(3, >> "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\09v\1\0004\0\0\0"..., >> 512) = 512 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> _llseek(3, 949188, [949188], SEEK_SET) = 0 >> read(3, >> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., >> 2840) = 2840 >> _llseek(3, 945756, [945756], SEEK_SET) = 0 >> read(3, "A4\0\0\0aeabi\0\1*\0\0\0\0057-A\0\6\n\7A\10\1\t\2\n\3\f"..., >> 53) = 53 >> fstat64(3, {st_mode=S_IFREG|0755, st_size=952028, ...}) = 0 >> mmap2(NULL, 1020732, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, >> 0) = 0xb6c5a000 >> mprotect(0xb6d3e000, 65536, PROT_NONE) = 0 >> mmap2(0xb6d4e000, 12288, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe4000) = 0xb6d4e000 >> mmap2(0xb6d51000, 9020, PROT_READ|PROT_WRITE, >> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6d51000 >> close(3) = 0 >> mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, >> 0) = 0xb6f53000 >> set_tls(0xb6f534d0) = 0 >> mprotect(0xb6d4e000, 8192, PROT_READ) = 0 >> mprotect(0xb6d7b000, 4096, PROT_READ) = 0 >> mprotect(0xb6df6000, 4096, PROT_READ) = 0 >> mprotect(0xb6efa000, 20480, PROT_READ) = 0 >> mprotect(0xb6f19000, 4096, PROT_READ) = 0 >> mprotect(0xb6f36000, 4096, PROT_READ) = 0 >> mprotect(0x491000, 4096, PROT_READ) = 0 >> mprotect(0xb6f60000, 4096, PROT_READ) = 0 >> munmap(0xb6f55000, 35157) = 0 >> brk(NULL) = 0x1017000 >> brk(0x1038000) = 0x1038000 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/class/udc", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> getdents64(3, /* 3 entries */, 32768) = 88 >> getdents64(3, /* 0 entries */, 32768) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> getdents64(3, /* 3 entries */, 32768) = 72 >> getdents64(3, /* 0 entries */, 32768) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget/g1/UDC", O_RDONLY) = 3 >> fstat64(3, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0 >> read(3, "\n", 4096) = 1 >> read(3, "", 4096) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget/g1/functions", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> getdents64(3, /* 4 entries */, 32768) = 112 >> getdents64(3, /* 0 entries */, 32768) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget/g1/configs", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> getdents64(3, /* 2 entries */, 32768) = 48 >> getdents64(3, /* 0 entries */, 32768) = 0 >> close(3) = 0 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget/g1/os_desc", >> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC|O_DIRECTORY) = 3 >> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 >> getdents64(3, /* 5 entries */, 32768) = 144 >> getdents64(3, /* 0 entries */, 32768) = 0 >> close(3) = 0 >> write(2, "usbg_create_gadget() duplicate "..., 46usbg_create_gadget() >> duplicate gadget name >> >> ) = 46 >> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x4, 0x40), ...}) = 0 >> ioctl(1, TCGETS, {B115200 opost isig icanon echo ...}) = 0 >> write(1, "gadget exists.\n", 15gadget exists. >> ) = 15 >> openat(AT_FDCWD, "/sys/kernel/config/usb_gadget/g1/functions/ffs.dev0", >> O_RDONLY) = 3 >> fchdir(3) = 0 >> openat(AT_FDCWD, "ep0", O_RDWR) = -1 ENOENT (No such file or >> directory) >> write(2, "unable to create ep0: 2 : No suc"..., 52unable to create ep0: >> 2 : No such file or directory >> ) = 52 >> close(3) = 0 >> exit_group(0) = ? >> +++ exited with 0 +++ >> >> ``` >> > > I created the configs as well. Still can't open ep0. Really -- is there a device or UDC someone can verify has worked in the past? Seems easiest way for me to proceed. > > I can get more info if it'll help, but I assume some device is already working. You cannot open ep0 because you didn't mounted ffs instance. after you created /sys/kernel/config/usb_gadget/g1/functions/ffs.dev0 you need to: mount -t functionfs dev0 /some/path then you open(/some/path/ep0); Best regards, -- Krzysztof Opasiak Samsung R&D Institute Poland Samsung Electronics
