From: "Sid Spry" <sid@aeam.us>
To: "Krzysztof Opasiak" <k.opasiak@samsung.com>, linux-usb@vger.kernel.org
Subject: Re: Unable to open(2) ep0 in ConfigFG FunctionFS Gadget
Date: Mon, 01 Jun 2020 22:05:23 -0500 [thread overview]
Message-ID: <f4e21b43-b693-4301-ad12-0f070c519888@www.fastmail.com> (raw)
In-Reply-To: <83a1b0ef-29d2-0abb-5891-e3aa4478dd5c@samsung.com>
On Tue, May 26, 2020, at 3:03 PM, Krzysztof Opasiak wrote:
>
>
> 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);
>
Sigh... Thanks.
> Best regards,
> --
> Krzysztof Opasiak
> Samsung R&D Institute Poland
> Samsung Electronics
>
prev parent reply other threads:[~2020-06-02 3:06 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
2020-05-26 20:03 ` Krzysztof Opasiak
2020-06-02 3:05 ` Sid Spry [this message]
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