From: "Sid Spry" <sid@aeam.us>
To: linux-usb@vger.kernel.org
Subject: Re: Unable to open(2) ep0 in ConfigFG FunctionFS Gadget
Date: Tue, 26 May 2020 14:51:13 -0500 [thread overview]
Message-ID: <f5180146-3bec-4dff-8fbd-9dab9e659239@www.fastmail.com> (raw)
In-Reply-To: <eaa2bcfb-21c2-4a9f-bdad-44ebd293b0e3@www.fastmail.com>
On Wed, May 20, 2020, at 11:22 AM, Sid Spry wrote:
> Crossreffing
> https://github.com/torvalds/linux/blob/2f4c53349961c8ca480193e47da4d44fdb8335a8/tools/usb/ffs-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.
next prev parent reply other threads:[~2020-05-26 19:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 16:22 Unable to open(2) ep0 in ConfigFG FunctionFS Gadget Sid Spry
2020-05-26 19:51 ` Sid Spry [this message]
2020-05-26 20:03 ` Krzysztof Opasiak
2020-06-02 3:05 ` Sid Spry
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