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libc: Add fscandir(), fscandir_b(), scandirat_b().
While here, clean up scandir() a bit and improve the documentation. MFC after: never Sponsored by: Klara, Inc. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D50935
This commit is contained in:
Dag-Erling Smørgrav
parent
609720ed97
commit
deeebfdeca
8 changed files with 410 additions and 42 deletions
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@ -130,9 +130,22 @@ int scandir_b(const char *, struct dirent ***,
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#endif
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#endif
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#if __BSD_VISIBLE
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int fscandir(int, struct dirent ***,
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int (*)(const struct dirent *), int (*)(const struct dirent **,
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const struct dirent **));
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#ifdef __BLOCKS__
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int fscandir_b(int, struct dirent ***,
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int (^)(const struct dirent *),
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int (^)(const struct dirent **, const struct dirent **));
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#endif
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int scandirat(int, const char *, struct dirent ***,
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int (*)(const struct dirent *), int (*)(const struct dirent **,
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const struct dirent **));
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#ifdef __BLOCKS__
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int scandirat_b(int, const char *, struct dirent ***,
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int (^)(const struct dirent *),
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int (^)(const struct dirent **, const struct dirent **));
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#endif
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#endif
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#if __XSI_VISIBLE
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void seekdir(DIR *, long);
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@ -499,8 +499,11 @@ MLINKS+=rand48.3 _rand48.3 \
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MLINKS+=rtld_get_var.3 \
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rtld_set_var.3
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MLINKS+=scandir.3 alphasort.3 \
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scandir.3 scandirat.3 \
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scandir.3 fscandir.3 \
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scandir.3 fscandir_b.3 \
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scandir.3 scandir_b.3 \
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scandir.3 scandirat.3 \
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scandir.3 scandirat_b.3 \
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scandir.3 versionsort.3
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MLINKS+=sem_open.3 sem_close.3 \
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sem_open.3 sem_unlink.3
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@ -458,11 +458,14 @@ FBSD_1.8 {
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aio_read2;
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aio_write2;
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execvpe;
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fscandir;
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fscandir_b;
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fts_open_b;
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glob_b;
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psiginfo;
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rtld_get_var;
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rtld_set_var;
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scandirat_b;
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uexterr_gettext;
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sig2str;
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str2sig;
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@ -25,13 +25,16 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd August 31, 2023
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.Dd June 19, 2025
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.Dt SCANDIR 3
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.Os
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.Sh NAME
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.Nm scandir ,
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.Nm fscandir ,
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.Nm scandirat ,
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.Nm scandir_b ,
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.Nm fscandir_b ,
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.Nm fscandirat_b ,
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.Nm alphasort ,
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.Nm versionsort
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.Nd scan a directory
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@ -47,6 +50,13 @@
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.Fa "int \*(lp*compar\*(rp\*(lpconst struct dirent **, const struct dirent **\*(rp"
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.Fc
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.Ft int
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.Fo fscandir
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.Fa "int dirfd"
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.Fa "struct dirent ***namelist"
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.Fa "int \*(lp*select\*(rp\*(lpconst struct dirent *\*(rp"
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.Fa "int \*(lp*compar\*(rp\*(lpconst struct dirent **, const struct dirent **\*(rp"
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.Fc
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.Ft int
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.Fo scandirat
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.Fa "int dirfd"
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.Fa "const char *dirname"
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@ -62,6 +72,21 @@
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.Fa "int \*(lp^compar\*(rp\*(lpconst struct dirent **, const struct dirent **\*(rp"
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.Fc
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.Ft int
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.Fo fscandir_b
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.Fa "int dirfd"
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.Fa "struct dirent ***namelist"
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.Fa "int \*(lp^select\*(rp\*(lpconst struct dirent *\*(rp"
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.Fa "int \*(lp^compar\*(rp\*(lpconst struct dirent **, const struct dirent **\*(rp"
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.Fc
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.Ft int
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.Fo scandirat_b
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.Fa "int dirfd"
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.Fa "const char *dirname"
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.Fa "struct dirent ***namelist"
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.Fa "int \*(lp^select\*(rp\*(lpconst struct dirent *\*(rp"
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.Fa "int \*(lp^compar\*(rp\*(lpconst struct dirent **, const struct dirent **\*(rp"
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.Fc
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.Ft int
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.Fn alphasort "const struct dirent **d1" "const struct dirent **d2"
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.Ft int
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.Fn versionsort "const struct dirent **d1" "const struct dirent **d2"
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@ -118,6 +143,13 @@ The memory allocated for the array can be deallocated with
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by freeing each pointer in the array and then the array itself.
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.Pp
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The
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.Fn fscandir
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function is similar to
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.Fn scandir ,
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but takes a file descriptor referencing a directory instead of a path.
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The file descriptor is left open on return, regardless of outcome.
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.Pp
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The
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.Fn scandirat
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function is similar to
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.Fn scandir ,
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@ -151,17 +183,37 @@ See
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for additional details.
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.Pp
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The
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.Fn scandir_b
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function behaves in the same way as
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.Fn scandir_b ,
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.Fn fscandir_b ,
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and
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.Fn scandirat_b
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functions behave in the same way as
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.Fn scandir ,
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but takes blocks as arguments instead of function pointers and calls
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.Fn fscandir ,
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and
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.Fn scandirat ,
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respectively,
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but take blocks as arguments instead of function pointers and call
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.Fn qsort_b
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rather than
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.Fn qsort .
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.Sh DIAGNOSTICS
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Returns \-1 if the directory cannot be opened for reading or if
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The
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.Fn scandir ,
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.Fn fscandir ,
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.Fn scandirat ,
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.Fn scandir_b ,
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.Fn fscandir_b ,
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and
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.Fn scandirat_b
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functions return the number of directory entries found on succes.
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If the directory cannot be opened for reading, an error occurs
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while reading the directory, or
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.Xr malloc 3
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cannot allocate enough memory to hold all the data structures.
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cannot allocate enough memory to hold all the directory entries,
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they return \-1 and set
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.Va errno
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to an appropriate value.
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.Sh SEE ALSO
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.Xr openat 2 ,
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.Xr directory 3 ,
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@ -172,8 +224,25 @@ cannot allocate enough memory to hold all the data structures.
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.Xr dir 5
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.Sh STANDARDS
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The
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.Fn alphasort
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and
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.Fn scandir
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functions are expected to conform to
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.St -p1003.1-2008 .
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The
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.Fn scandirat
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and
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.Fn versionsort
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function is a GNU extension and conforms to no standard.
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functions are GNU extensions and conform to no standard.
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The
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.Fn fscandir ,
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.Fn scandir_b ,
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.Fn fscandir_b ,
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and
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.Fn scandirat_b
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functions are
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.Fx
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extensions.
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.Sh HISTORY
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The
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.Fn scandir
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@ -182,8 +251,19 @@ and
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functions appeared in
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.Bx 4.2 .
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The
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.Fn scandir_b
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function was added in
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.Fx 11.0 .
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The
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.Fn scandirat
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and
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.Fn versionsort
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functions were added in
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.Fx 13.2 .
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The
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.Fn fscandir ,
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.Fn fscandir_b ,
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and
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.Fn scandirat_b
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functions were added in
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.Fx 15.0 .
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@ -38,6 +38,7 @@
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#include "namespace.h"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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@ -64,7 +65,7 @@ static int scandir_thunk_cmp(const void *p1, const void *p2, void *thunk);
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static int
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#ifdef I_AM_SCANDIR_B
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scandir_b_dirp(DIR *dirp, struct dirent ***namelist, select_block select,
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scandir_dirp_b(DIR *dirp, struct dirent ***namelist, select_block select,
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dcomp_block dcomp)
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#else
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scandir_dirp(DIR *dirp, struct dirent ***namelist,
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@ -72,14 +73,9 @@ scandir_dirp(DIR *dirp, struct dirent ***namelist,
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const struct dirent **))
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#endif
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{
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struct dirent *d, *p, **names = NULL;
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size_t arraysz, numitems;
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numitems = 0;
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arraysz = 32; /* initial estimate of the array size */
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names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
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if (names == NULL)
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goto fail;
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struct dirent *d, *p = NULL, **names = NULL, **names2;
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size_t arraysz = 0, numitems = 0;
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int serrno;
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while ((d = readdir(dirp)) != NULL) {
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if (select != NULL && !SELECT(d))
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@ -87,33 +83,27 @@ scandir_dirp(DIR *dirp, struct dirent ***namelist,
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/*
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* Make a minimum size copy of the data
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*/
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p = (struct dirent *)malloc(_GENERIC_DIRSIZ(d));
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p = malloc(_GENERIC_DIRSIZ(d));
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if (p == NULL)
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goto fail;
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p->d_fileno = d->d_fileno;
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p->d_type = d->d_type;
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p->d_reclen = d->d_reclen;
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p->d_namlen = d->d_namlen;
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bcopy(d->d_name, p->d_name, p->d_namlen + 1);
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memcpy(p->d_name, d->d_name, p->d_namlen + 1);
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/*
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* Check to make sure the array has space left and
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* realloc the maximum size.
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*/
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if (numitems >= arraysz) {
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struct dirent **names2;
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names2 = reallocarray(names, arraysz,
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2 * sizeof(struct dirent *));
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if (names2 == NULL) {
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free(p);
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arraysz = arraysz ? arraysz * 2 : 32;
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names2 = reallocarray(names, arraysz, sizeof(*names));
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if (names2 == NULL)
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goto fail;
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}
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names = names2;
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arraysz *= 2;
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}
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names[numitems++] = p;
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}
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closedir(dirp);
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if (numitems && dcomp != NULL)
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#ifdef I_AM_SCANDIR_B
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qsort_b(names, numitems, sizeof(struct dirent *), (void*)dcomp);
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@ -125,10 +115,12 @@ scandir_dirp(DIR *dirp, struct dirent ***namelist,
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return (numitems);
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fail:
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serrno = errno;
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free(p);
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while (numitems > 0)
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free(names[--numitems]);
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free(names);
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closedir(dirp);
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errno = serrno;
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return (-1);
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}
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@ -143,39 +135,82 @@ scandir(const char *dirname, struct dirent ***namelist,
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#endif
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{
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DIR *dirp;
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int ret, serrno;
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dirp = opendir(dirname);
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if (dirp == NULL)
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return (-1);
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return (
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ret =
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#ifdef I_AM_SCANDIR_B
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scandir_b_dirp
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scandir_dirp_b
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#else
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scandir_dirp
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#endif
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(dirp, namelist, select, dcomp));
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(dirp, namelist, select, dcomp);
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serrno = errno;
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closedir(dirp);
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errno = serrno;
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return (ret);
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}
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#ifndef I_AM_SCANDIR_B
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int
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#ifdef I_AM_SCANDIR_B
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fscandir_b(int dirfd, struct dirent ***namelist, select_block select,
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dcomp_block dcomp)
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#else
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fscandir(int dirfd, struct dirent ***namelist,
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int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **,
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const struct dirent **))
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#endif
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{
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DIR *dirp;
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int ret, serrno;
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dirp = fdopendir(dirfd);
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if (dirp == NULL)
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return (-1);
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ret =
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#ifdef I_AM_SCANDIR_B
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scandir_dirp_b
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#else
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scandir_dirp
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#endif
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(dirp, namelist, select, dcomp);
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serrno = errno;
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fdclosedir(dirp);
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errno = serrno;
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return (ret);
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}
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int
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#ifdef I_AM_SCANDIR_B
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scandirat_b(int dirfd, const char *dirname, struct dirent ***namelist,
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select_block select, dcomp_block dcomp)
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#else
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scandirat(int dirfd, const char *dirname, struct dirent ***namelist,
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int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **,
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const struct dirent **))
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#endif
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{
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DIR *dirp;
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int fd;
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int fd, ret, serrno;
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fd = _openat(dirfd, dirname, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
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if (fd == -1)
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return (-1);
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dirp = fdopendir(fd);
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if (dirp == NULL) {
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_close(fd);
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return (-1);
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}
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return (scandir_dirp(dirp, namelist, select, dcomp));
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ret =
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#ifdef I_AM_SCANDIR_B
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fscandir_b
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#else
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fscandir
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#endif
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(fd, namelist, select, dcomp);
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serrno = errno;
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_close(fd);
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errno = serrno;
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return (ret);
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}
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#ifndef I_AM_SCANDIR_B
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/*
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* Alphabetic order comparison routine for those who want it.
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* POSIX 2008 requires that alphasort() uses strcoll().
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@ -22,6 +22,10 @@ ATF_TESTS_C+= makecontext_test
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ATF_TESTS_C+= popen_test
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ATF_TESTS_C+= posix_spawn_test
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ATF_TESTS_C+= realpath2_test
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ATF_TESTS_C+= scandir_test
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.if ${COMPILER_FEATURES:Mblocks}
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ATF_TESTS_C+= scandir_blocks_test
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.endif
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ATF_TESTS_C+= sig2str_test
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ATF_TESTS_C+= sigsetops_test
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ATF_TESTS_C+= wordexp_test
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@ -101,7 +105,7 @@ TESTS_SUBDIRS= execve
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TESTS_SUBDIRS+= posix_spawn
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# Tests that require blocks support
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.for t in fts_blocks_test glob_blocks_test
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.for t in fts_blocks_test glob_blocks_test scandir_blocks_test
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CFLAGS.${t}.c+= -fblocks
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LIBADD.${t}+= BlocksRuntime
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.endfor
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|
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118
lib/libc/tests/gen/scandir_blocks_test.c
Normal file
118
lib/libc/tests/gen/scandir_blocks_test.c
Normal file
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@ -0,0 +1,118 @@
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/*-
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* Copyright (c) 2025 Klara, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sys/stat.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <atf-c.h>
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static void
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scandir_blocks_prepare(const struct atf_tc *tc)
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{
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ATF_REQUIRE_EQ(0, mkdir("dir", 0755));
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ATF_REQUIRE_EQ(0, mkdir("dir/dir", 0755));
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ATF_REQUIRE_EQ(0, close(creat("dir/file", 0644)));
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ATF_REQUIRE_EQ(0, symlink("file", "dir/link"));
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ATF_REQUIRE_EQ(0, mkdir("dir/skip", 0755));
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}
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static void
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scandir_blocks_verify(const struct atf_tc *tc, int n, struct dirent **namelist)
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{
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ATF_REQUIRE_EQ_MSG(5, n, "return value is %d", n);
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ATF_CHECK_STREQ("link", namelist[0]->d_name);
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ATF_CHECK_STREQ("file", namelist[1]->d_name);
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ATF_CHECK_STREQ("dir", namelist[2]->d_name);
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ATF_CHECK_STREQ("..", namelist[3]->d_name);
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ATF_CHECK_STREQ(".", namelist[4]->d_name);
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}
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ATF_TC(scandir_b_test);
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ATF_TC_HEAD(scandir_b_test, tc)
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||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test scandir_b()");
|
||||
}
|
||||
ATF_TC_BODY(scandir_b_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int i, ret;
|
||||
|
||||
scandir_blocks_prepare(tc);
|
||||
ret = scandir_b("dir", &namelist,
|
||||
^(const struct dirent *ent) {
|
||||
return (strcmp(ent->d_name, "skip") != 0);
|
||||
},
|
||||
^(const struct dirent **a, const struct dirent **b) {
|
||||
return (strcmp((*b)->d_name, (*a)->d_name));
|
||||
});
|
||||
scandir_blocks_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
}
|
||||
|
||||
ATF_TC(fscandir_b_test);
|
||||
ATF_TC_HEAD(fscandir_b_test, tc)
|
||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test fscandir_b()");
|
||||
}
|
||||
ATF_TC_BODY(fscandir_b_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int fd, i, ret;
|
||||
|
||||
scandir_blocks_prepare(tc);
|
||||
ATF_REQUIRE((fd = open("dir", O_DIRECTORY | O_RDONLY)) >= 0);
|
||||
ret = fscandir_b(fd, &namelist,
|
||||
^(const struct dirent *ent) {
|
||||
return (strcmp(ent->d_name, "skip") != 0);
|
||||
},
|
||||
^(const struct dirent **a, const struct dirent **b) {
|
||||
return (strcmp((*b)->d_name, (*a)->d_name));
|
||||
});
|
||||
scandir_blocks_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
ATF_REQUIRE_EQ(0, close(fd));
|
||||
}
|
||||
|
||||
ATF_TC(scandirat_b_test);
|
||||
ATF_TC_HEAD(scandirat_b_test, tc)
|
||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test scandirat_b()");
|
||||
}
|
||||
ATF_TC_BODY(scandirat_b_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int fd, i, ret;
|
||||
|
||||
scandir_blocks_prepare(tc);
|
||||
ATF_REQUIRE((fd = open("dir", O_DIRECTORY | O_SEARCH)) >= 0);
|
||||
ret = scandirat_b(fd, ".", &namelist,
|
||||
^(const struct dirent *ent) {
|
||||
return (strcmp(ent->d_name, "skip") != 0);
|
||||
},
|
||||
^(const struct dirent **a, const struct dirent **b) {
|
||||
return (strcmp((*b)->d_name, (*a)->d_name));
|
||||
});
|
||||
scandir_blocks_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
ATF_REQUIRE_EQ(0, close(fd));
|
||||
}
|
||||
|
||||
ATF_TP_ADD_TCS(tp)
|
||||
{
|
||||
ATF_TP_ADD_TC(tp, scandir_b_test);
|
||||
ATF_TP_ADD_TC(tp, fscandir_b_test);
|
||||
ATF_TP_ADD_TC(tp, scandirat_b_test);
|
||||
return (atf_no_error());
|
||||
}
|
||||
112
lib/libc/tests/gen/scandir_test.c
Normal file
112
lib/libc/tests/gen/scandir_test.c
Normal file
|
|
@ -0,0 +1,112 @@
|
|||
/*-
|
||||
* Copyright (c) 2025 Klara, Inc.
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include <dirent.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#include <atf-c.h>
|
||||
|
||||
static void
|
||||
scandir_prepare(const struct atf_tc *tc)
|
||||
{
|
||||
ATF_REQUIRE_EQ(0, mkdir("dir", 0755));
|
||||
ATF_REQUIRE_EQ(0, mkdir("dir/dir", 0755));
|
||||
ATF_REQUIRE_EQ(0, close(creat("dir/file", 0644)));
|
||||
ATF_REQUIRE_EQ(0, symlink("file", "dir/link"));
|
||||
ATF_REQUIRE_EQ(0, mkdir("dir/skip", 0755));
|
||||
}
|
||||
|
||||
static void
|
||||
scandir_verify(const struct atf_tc *tc, int n, struct dirent **namelist)
|
||||
{
|
||||
ATF_REQUIRE_EQ_MSG(5, n, "return value is %d", n);
|
||||
ATF_CHECK_STREQ("link", namelist[0]->d_name);
|
||||
ATF_CHECK_STREQ("file", namelist[1]->d_name);
|
||||
ATF_CHECK_STREQ("dir", namelist[2]->d_name);
|
||||
ATF_CHECK_STREQ("..", namelist[3]->d_name);
|
||||
ATF_CHECK_STREQ(".", namelist[4]->d_name);
|
||||
}
|
||||
|
||||
static int
|
||||
scandir_select(const struct dirent *ent)
|
||||
{
|
||||
return (strcmp(ent->d_name, "skip") != 0);
|
||||
}
|
||||
|
||||
static int
|
||||
scandir_compare(const struct dirent **a, const struct dirent **b)
|
||||
{
|
||||
return (strcmp((*b)->d_name, (*a)->d_name));
|
||||
}
|
||||
|
||||
ATF_TC(scandir_test);
|
||||
ATF_TC_HEAD(scandir_test, tc)
|
||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test scandir()");
|
||||
}
|
||||
ATF_TC_BODY(scandir_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int i, ret;
|
||||
|
||||
scandir_prepare(tc);
|
||||
ret = scandir("dir", &namelist, scandir_select, scandir_compare);
|
||||
scandir_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
}
|
||||
|
||||
ATF_TC(fscandir_test);
|
||||
ATF_TC_HEAD(fscandir_test, tc)
|
||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test fscandir()");
|
||||
}
|
||||
ATF_TC_BODY(fscandir_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int fd, i, ret;
|
||||
|
||||
scandir_prepare(tc);
|
||||
ATF_REQUIRE((fd = open("dir", O_DIRECTORY | O_RDONLY)) >= 0);
|
||||
ret = fscandir(fd, &namelist, scandir_select, scandir_compare);
|
||||
scandir_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
ATF_REQUIRE_EQ(0, close(fd));
|
||||
}
|
||||
|
||||
ATF_TC(scandirat_test);
|
||||
ATF_TC_HEAD(scandirat_test, tc)
|
||||
{
|
||||
atf_tc_set_md_var(tc, "descr", "Test scandirat()");
|
||||
}
|
||||
ATF_TC_BODY(scandirat_test, tc)
|
||||
{
|
||||
struct dirent **namelist = NULL;
|
||||
int fd, i, ret;
|
||||
|
||||
scandir_prepare(tc);
|
||||
ATF_REQUIRE((fd = open("dir", O_DIRECTORY | O_SEARCH)) >= 0);
|
||||
ret = scandirat(fd, ".", &namelist, scandir_select, scandir_compare);
|
||||
scandir_verify(tc, ret, namelist);
|
||||
for (i = 0; i < ret; i++)
|
||||
free(namelist[i]);
|
||||
free(namelist);
|
||||
ATF_REQUIRE_EQ(0, close(fd));
|
||||
}
|
||||
|
||||
ATF_TP_ADD_TCS(tp)
|
||||
{
|
||||
ATF_TP_ADD_TC(tp, scandir_test);
|
||||
ATF_TP_ADD_TC(tp, fscandir_test);
|
||||
ATF_TP_ADD_TC(tp, scandirat_test);
|
||||
return (atf_no_error());
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue