| diff --git a/src/mkfs.fat.c b/src/mkfs.fat.c |
| index 91eb5d8..7165dce 100644 |
| --- a/src/mkfs.fat.c |
| +++ b/src/mkfs.fat.c |
| @@ -1860,7 +1860,17 @@ int main(int argc, char **argv) |
| |
| if (!create) { |
| check_mount(device_name); /* Is the device already mounted? */ |
| - dev = open(device_name, O_EXCL | O_RDWR); /* Is it a suitable device to build the FS on? */ |
| + |
| + /* skip calling open() if fd path is provided */ |
| + int fd = -1; |
| + int len = 0; |
| + if (sscanf(device_name, "/dev/fd/%u%n", &fd, &len) == 1 && len == strlen(device_name)) { |
| + dev = fd; |
| + printf("skipping open and using provided fd: %d\n", dev); |
| + } |
| + if (dev == -1) { |
| + dev = open(device_name, O_EXCL | O_RDWR); /* Is it a suitable device to build the FS on? */ |
| + } |
| if (dev < 0) { |
| fprintf(stderr, "%s: unable to open %s: %s\n", program_name, |
| device_name, strerror(errno)); |
