[OE-core] [PATCH][krogoth] nss: fix compilation with glibc-2.24

[akuster808]

Enrico,

On 10/27/2016 11:06 PM, Enrico Jorns wrote:
> `readdir_r` is deprecated as of glibc-2.24 and leads to a compilation
> error:
>
> | In file included from sysrand.c:16:0:
> | unix_rand.c: In function 'ReadOneFile':
> | unix_rand.c:1090:6: error: 'readdir_r' is deprecated [-Werror=deprecated-declarations]
> |       error = readdir_r(fd, &entry_dir, &result);
> |       ^~~~~
> | In file included from unix_rand.c:1032:0,
> |                  from sysrand.c:16:
> | /usr/include/dirent.h:183:12: note: declared here
> |  extern int readdir_r (DIR *__restrict __dirp,
> |             ^~~~~~~~~
> | cc1: all warnings being treated as errors
>
> The issue is reported in nss bug tracker
> (https://bugzilla.mozilla.org/show_bug.cgi?id=1254334) and fixed in nss
> mainline.
> The fixing patch is extracted from the nss source code repository.
>
> Signed-off-by: Enrico Jorns <ejo at pengutronix.de>
> ---
>   .../nss/nss/use-readdir-instead-of-readdir_r.patch | 95 ++++++++++++++++++++++
>   meta/recipes-support/nss/nss_3.21.bb               |  1 +
>   2 files changed, 96 insertions(+)
>   create mode 100644 meta/recipes-support/nss/nss/use-readdir-instead-of-readdir_r.patch
>
> diff --git a/meta/recipes-support/nss/nss/use-readdir-instead-of-readdir_r.patch b/meta/recipes-support/nss/nss/use-readdir-instead-of-readdir_r.patch
> new file mode 100644
> index 0000000..00f671f
> --- /dev/null
> +++ b/meta/recipes-support/nss/nss/use-readdir-instead-of-readdir_r.patch
> @@ -0,0 +1,95 @@
> +# HG changeset patch
> +# User Martin Thomson <martin.thomson at gmail.com>
> +# Date 1457600884 -39600
> +#      Thu Mar 10 20:08:04 2016 +1100
> +# Node ID 7309fcbce2eceae1e4e3c687348e540905ae286a
> +# Parent  e7b6fca4f01427cafb4328f6e279af62290a2f34
> +Bug 1254334 - Use readdir instead of readdir_r, r=emaldona, sr=rrelyea

The patch is missing the appropriate patch formating. I am expecting 
"Upstream-Status: blah" etc

http://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines

- Armin
> +
> +diff -r e7b6fca4f014 -r 7309fcbce2ec lib/freebl/unix_rand.c
> +--- a/nss/lib/freebl/unix_rand.c	Wed Apr 20 15:22:46 2016 +0200
> ++++ b/nss/lib/freebl/unix_rand.c	Thu Mar 10 20:08:04 2016 +1100
> +@@ -1054,26 +1054,16 @@
> +  *
> +  * return 1 if it's time to reset the fileToRead (no more files to read).
> +  */
> +-int ReadOneFile(int fileToRead)
> ++static int
> ++ReadOneFile(int fileToRead)
> + {
> +     char *dir = "/etc";
> +     DIR *fd = opendir(dir);
> +     int resetCount = 0;
> +-#ifdef SOLARIS
> +-     /* grumble, Solaris does not define struct dirent to be the full length */
> +-    typedef union {
> +-	unsigned char space[sizeof(struct dirent) + MAXNAMELEN];
> +-	struct dirent dir;
> +-    } dirent_hack;
> +-    dirent_hack entry, firstEntry;
> +-
> +-#define entry_dir entry.dir
> +-#else
> +-    struct dirent entry, firstEntry;
> +-#define entry_dir entry
> +-#endif
> +-
> +-    int i, error = -1;
> ++    struct dirent *entry;
> ++    char firstName[NAME_MAX + 1];
> ++    const char *name = NULL;
> ++    int i;
> +
> +     if (fd == NULL) {
> + 	dir = PR_GetEnvSecure("HOME");
> +@@ -1085,33 +1075,34 @@
> + 	return 1;
> +     }
> +
> ++    firstName[0] = '\0';
> +     for (i=0; i <= fileToRead; i++) {
> +-	struct dirent *result = NULL;
> + 	do {
> +-	    error = readdir_r(fd, &entry_dir, &result);
> +-	} while (error == 0 && result != NULL  &&
> +-					!ReadFileOK(dir,&result->d_name[0]));
> +-	if (error != 0 || result == NULL)  {
> ++            /* readdir() isn't guaranteed to be thread safe on every platform;
> ++             * this code assumes the same directory isn't read concurrently.
> ++             * This usage is confirmed safe on Linux, see bug 1254334. */
> ++	    entry = readdir(fd);
> ++	} while (entry != NULL && !ReadFileOK(dir, &entry->d_name[0]));
> ++	if (entry == NULL)  {
> + 	    resetCount = 1; /* read to the end, start again at the beginning */
> +-	    if (i != 0) {
> ++	    if (firstName[0]) {
> + 		/* ran out of entries in the directory, use the first one */
> +-	 	entry = firstEntry;
> +-	 	error = 0;
> +-	 	break;
> ++	 	name = firstName;
> + 	    }
> +-	    /* if i== 0, there were no readable entries in the directory */
> + 	    break;
> + 	}
> +-	if (i==0) {
> +-	    /* save the first entry in case we run out of entries */
> +-	    firstEntry = entry;
> ++        name = entry->d_name;
> ++	if (i == 0) {
> ++	    /* copy the name of the first in case we run out of entries */
> ++            PORT_Assert(PORT_Strlen(name) <= NAME_MAX);
> ++            PORT_Strncpy(firstName, name, NAME_MAX);
> ++            firstName[NAME_MAX] = '\0';
> + 	}
> +     }
> +
> +-    if (error == 0) {
> ++    if (name) {
> + 	char filename[PATH_MAX];
> +-	int count = snprintf(filename, sizeof filename,
> +-				"%s/%s",dir, &entry_dir.d_name[0]);
> ++	int count = snprintf(filename, sizeof(filename), "%s/%s",dir, name);
> + 	if (count >= 1) {
> + 	    ReadSingleFile(filename);
> + 	}
> diff --git a/meta/recipes-support/nss/nss_3.21.bb b/meta/recipes-support/nss/nss_3.21.bb
> index 05d81c2..39b0994 100644
> --- a/meta/recipes-support/nss/nss_3.21.bb
> +++ b/meta/recipes-support/nss/nss_3.21.bb
> @@ -21,6 +21,7 @@ SRC_URI = "\
>       file://nss-fix-incorrect-shebang-of-perl.patch \
>       file://nss-fix-nsinstall-build.patch \
>       file://0001-Fix-build-failure-on-opensuse-13.1.patch \
> +    file://use-readdir-instead-of-readdir_r.patch \
>       file://nss-gcc6-fix.patch \
>       file://nss.pc.in \
>       file://signlibs.sh \