diff options
Diffstat (limited to 'libc/arch-mips64/bionic/getdents.cpp')
| -rw-r--r-- | libc/arch-mips64/bionic/getdents.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/libc/arch-mips64/bionic/getdents.cpp b/libc/arch-mips64/bionic/getdents.cpp new file mode 100644 index 0000000..66a61ec --- /dev/null +++ b/libc/arch-mips64/bionic/getdents.cpp @@ -0,0 +1,97 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * The MIPS64 getdents64() system call is only present in 3.10+ kernels. + * If the getdents64() system call is not available fall back to using + * getdents() and modify the result to be compatible with getdents64(). + */ + +#include <dirent.h> + +#include <errno.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + + +/* The mips_getdents type is 64bit clean */ +struct mips_dirent { + uint64_t d_ino; /* Inode number */ + uint64_t d_off; /* Offset to next mips_dirent */ + uint16_t d_reclen; /* Length of this mips_dirent */ + char d_name[]; /* Filename (null-terminated) */ + /* length is actually (d_reclen - 2 - + offsetof(struct mips_dirent, d_name) */ + // char pad; /* Zero padding byte */ + // char d_type; /* File type (only since Linux 2.6.4; offset is (d_reclen - 1)) */ +}; + +extern "C" int __getdents64(unsigned int fd, struct dirent *dirp, unsigned int count); +extern "C" int __getdents(unsigned int fd, struct mips_dirent *dirp, unsigned int count); +int getdents(unsigned int fd, struct dirent *dirp, unsigned int count) +{ + int r; + int oerrno = errno; + + /* Use getdents64() if it is available */ + r = __getdents64(fd, dirp, count); + if (r >= 0 || errno != ENOSYS) + return r; + + /* Fallback to getdents() */ + errno = oerrno; + r = __getdents(fd, (struct mips_dirent *)dirp, count); + if (r > 0) { + char *p; + char type; + union dirents { + struct mips_dirent m; + struct dirent d; + } *u; + + p = (char *)dirp; + do { + u = (union dirents *)p; + + /* This should not happen, but just in case... */ + if (p + u->m.d_reclen > (char *)dirp + r) + break; + + /* shuffle the dirent */ + type = *(p + u->m.d_reclen - 1); + memmove(u->d.d_name, u->m.d_name, + u->m.d_reclen - 2 - offsetof(struct mips_dirent, d_name) + 1); + u->d.d_type = type; + + p += u->m.d_reclen; + } while (p < (char *)dirp + r); + } + return r; +} |