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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/bz23960] linux: Add __old_readdir64_unlocked Date: Thu, 16 Apr 2020 13:21:13 +0000 (GMT) [thread overview] Message-ID: <20200416132113.B5747386EC6D@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8bd86fb8bf2140beb8bfcefd548aa8092cddce2e commit 8bd86fb8bf2140beb8bfcefd548aa8092cddce2e Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Tue Apr 14 11:14:22 2020 -0300 linux: Add __old_readdir64_unlocked And use it __old_readdir64_r. Checked on i686-linux-gnu. Diff: --- sysdeps/unix/sysv/linux/olddirent.h | 2 + sysdeps/unix/sysv/linux/readdir64.c | 21 +++++++--- sysdeps/unix/sysv/linux/readdir64_r.c | 79 ++++++++--------------------------- 3 files changed, 35 insertions(+), 67 deletions(-) diff --git a/sysdeps/unix/sysv/linux/olddirent.h b/sysdeps/unix/sysv/linux/olddirent.h index 2d2559c1e9..b118b0ef96 100644 --- a/sysdeps/unix/sysv/linux/olddirent.h +++ b/sysdeps/unix/sysv/linux/olddirent.h @@ -32,6 +32,8 @@ struct __old_dirent64 /* Now define the internal interfaces. */ extern struct __old_dirent64 *__old_readdir64 (DIR *__dirp); libc_hidden_proto (__old_readdir64); +extern struct __old_dirent64 *__old_readdir64_unlocked (DIR *__dirp) + attribute_hidden; extern int __old_readdir64_r (DIR *__dirp, struct __old_dirent64 *__entry, struct __old_dirent64 **__result); extern __ssize_t __old_getdents64 (int __fd, char *__buf, size_t __nbytes) diff --git a/sysdeps/unix/sysv/linux/readdir64.c b/sysdeps/unix/sysv/linux/readdir64.c index 26e656acf7..4ce6024b38 100644 --- a/sysdeps/unix/sysv/linux/readdir64.c +++ b/sysdeps/unix/sysv/linux/readdir64.c @@ -112,15 +112,11 @@ versioned_symbol (libc, __readdir64, readdir64, GLIBC_2_2); attribute_compat_text_section struct __old_dirent64 * -__old_readdir64 (DIR *dirp) +__old_readdir64_unlocked (DIR *dirp) { struct __old_dirent64 *dp; int saved_errno = errno; -#if IS_IN (libc) - __libc_lock_lock (dirp->lock); -#endif - do { size_t reclen; @@ -164,6 +160,21 @@ __old_readdir64 (DIR *dirp) /* Skip deleted files. */ } while (dp->d_ino == 0); + return dp; +} + +attribute_compat_text_section +struct __old_dirent64 * +__old_readdir64 (DIR *dirp) +{ + struct __old_dirent64 *dp; + +#if IS_IN (libc) + __libc_lock_lock (dirp->lock); +#endif + + dp = __old_readdir64_unlocked (dirp); + #if IS_IN (libc) __libc_lock_unlock (dirp->lock); #endif diff --git a/sysdeps/unix/sysv/linux/readdir64_r.c b/sysdeps/unix/sysv/linux/readdir64_r.c index e5ef7be4c2..133c534a69 100644 --- a/sysdeps/unix/sysv/linux/readdir64_r.c +++ b/sysdeps/unix/sysv/linux/readdir64_r.c @@ -91,89 +91,44 @@ __old_readdir64_r (DIR *dirp, struct __old_dirent64 *entry, { struct __old_dirent64 *dp; size_t reclen; - const int saved_errno = errno; - int ret; __libc_lock_lock (dirp->lock); - do + while (1) { - if (dirp->offset >= dirp->size) - { - /* We've emptied out our buffer. Refill it. */ - - size_t maxread = dirp->allocation; - ssize_t bytes; - - maxread = dirp->allocation; - - bytes = __old_getdents64 (dirp->fd, dirp->data, maxread); - if (bytes <= 0) - { - /* On some systems getdents fails with ENOENT when the - open directory has been rmdir'd already. POSIX.1 - requires that we treat this condition like normal EOF. */ - if (bytes < 0 && errno == ENOENT) - { - bytes = 0; - __set_errno (saved_errno); - } - if (bytes < 0) - dirp->errcode = errno; - - dp = NULL; - break; - } - dirp->size = (size_t) bytes; - - /* Reset the offset into the buffer. */ - dirp->offset = 0; - } - - dp = (struct __old_dirent64 *) &dirp->data[dirp->offset]; + dp = __old_readdir64_unlocked (dirp); + if (dp == NULL) + break; reclen = dp->d_reclen; + if (reclen <= offsetof (struct __old_dirent64, d_name) + NAME_MAX + 1) + break; - dirp->offset += reclen; - - dirp->filepos = dp->d_off; - - if (reclen > offsetof (struct __old_dirent64, d_name) + NAME_MAX + 1) + /* The record is very long. It could still fit into the caller-supplied + buffer if we can skip padding at the end. */ + size_t namelen = _D_EXACT_NAMLEN (dp); + if (namelen <= NAME_MAX) { - /* The record is very long. It could still fit into the - caller-supplied buffer if we can skip padding at the - end. */ - size_t namelen = _D_EXACT_NAMLEN (dp); - if (namelen <= NAME_MAX) - reclen = offsetof (struct __old_dirent64, d_name) + namelen + 1; - else - { - /* The name is too long. Ignore this file. */ - dirp->errcode = ENAMETOOLONG; - dp->d_ino = 0; - continue; - } + reclen = offsetof (struct dirent64, d_name) + namelen + 1; + break; } - /* Skip deleted and ignored files. */ + /* The name is too long. Ignore this file. */ + dirp->errcode = ENAMETOOLONG; + dp->d_ino = 0; } - while (dp->d_ino == 0); if (dp != NULL) { *result = memcpy (entry, dp, reclen); entry->d_reclen = reclen; - ret = 0; } else - { - *result = NULL; - ret = dirp->errcode; - } + *result = NULL; __libc_lock_unlock (dirp->lock); - return ret; + return dp != NULL ? 0 : dirp->errcode; } compat_symbol (libc, __old_readdir64_r, readdir64_r, GLIBC_2_1);
next reply other threads:[~2020-04-16 13:21 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-16 13:21 Adhemerval Zanella [this message] -- strict thread matches above, loose matches on Subject: below -- 2020-10-02 13:53 Adhemerval Zanella 2020-04-17 13:23 Adhemerval Zanella 2020-04-15 14:15 Adhemerval Zanella 2020-04-14 21:09 Adhemerval Zanella
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