By making use of GNU C's cleanup attribute handled by the
VIR_AUTOFREE macro for declaring scalar variables, majority
of the VIR_FREE calls can be dropped, which in turn leads to
getting rid of most of our cleanup sections.
Signed-off-by: Sukrit Bhatnagar <skrtbht...@gmail.com>
Reviewed-by: Erik Skultety <eskul...@redhat.com>
---
src/util/virfile.c | 310 ++++++++++++++++++-----------------------------------
1 file changed, 102 insertions(+), 208 deletions(-)
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 2690e2d..3a7445f 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -211,7 +211,7 @@ virFileWrapperFdNew(int *fd, const char *name, unsigned int
flags)
bool output = false;
int pipefd[2] = { -1, -1 };
int mode = -1;
- char *iohelper_path = NULL;
+ VIR_AUTOFREE(char *) iohelper_path = NULL;
if (!flags) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -262,8 +262,6 @@ virFileWrapperFdNew(int *fd, const char *name, unsigned int
flags)
ret->cmd = virCommandNewArgList(iohelper_path, name, NULL);
- VIR_FREE(iohelper_path);
-
if (output) {
virCommandSetInputFD(ret->cmd, pipefd[0]);
virCommandSetOutputFD(ret->cmd, fd);
@@ -294,7 +292,6 @@ virFileWrapperFdNew(int *fd, const char *name, unsigned int
flags)
return ret;
error:
- VIR_FREE(iohelper_path);
VIR_FORCE_CLOSE(pipefd[0]);
VIR_FORCE_CLOSE(pipefd[1]);
virFileWrapperFdFree(ret);
@@ -492,7 +489,7 @@ virFileRewrite(const char *path,
virFileRewriteFunc rewrite,
const void *opaque)
{
- char *newfile = NULL;
+ VIR_AUTOFREE(char *) newfile = NULL;
int fd = -1;
int ret = -1;
@@ -533,10 +530,8 @@ virFileRewrite(const char *path,
cleanup:
VIR_FORCE_CLOSE(fd);
- if (newfile) {
+ if (newfile)
unlink(newfile);
- VIR_FREE(newfile);
- }
return ret;
}
@@ -763,7 +758,7 @@ int virFileLoopDeviceAssociate(const char *file,
int lofd = -1;
int fsfd = -1;
struct loop_info64 lo;
- char *loname = NULL;
+ VIR_AUTOFREE(char *) loname = NULL;
int ret = -1;
if ((lofd = virFileLoopDeviceOpen(&loname)) < 0)
@@ -801,7 +796,6 @@ int virFileLoopDeviceAssociate(const char *file,
ret = 0;
cleanup:
- VIR_FREE(loname);
VIR_FORCE_CLOSE(fsfd);
if (ret == -1)
VIR_FORCE_CLOSE(lofd);
@@ -816,8 +810,7 @@ int virFileLoopDeviceAssociate(const char *file,
static int
virFileNBDDeviceIsBusy(const char *dev_name)
{
- char *path;
- int ret = -1;
+ VIR_AUTOFREE(char *) path = NULL;
if (virAsprintf(&path, SYSFS_BLOCK_DIR "/%s/pid",
dev_name) < 0)
@@ -825,18 +818,14 @@ virFileNBDDeviceIsBusy(const char *dev_name)
if (!virFileExists(path)) {
if (errno == ENOENT)
- ret = 0;
+ return 0;
else
virReportSystemError(errno,
_("Cannot check NBD device %s pid"),
dev_name);
- goto cleanup;
+ return -1;
}
- ret = 1;
-
- cleanup:
- VIR_FREE(path);
- return ret;
+ return 1;
}
@@ -881,15 +870,13 @@ virFileNBDLoadDriver(void)
"administratively prohibited"));
return false;
} else {
- char *errbuf = NULL;
+ VIR_AUTOFREE(char *) errbuf = NULL;
if ((errbuf = virKModLoad(NBD_DRIVER, true))) {
- VIR_FREE(errbuf);
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to load nbd module"));
return false;
}
- VIR_FREE(errbuf);
}
return true;
}
@@ -899,8 +886,8 @@ int virFileNBDDeviceAssociate(const char *file,
bool readonly,
char **dev)
{
- char *nbddev = NULL;
- char *qemunbd = NULL;
+ VIR_AUTOFREE(char *) nbddev = NULL;
+ VIR_AUTOFREE(char *) qemunbd = NULL;
virCommandPtr cmd = NULL;
int ret = -1;
const char *fmtstr = NULL;
@@ -948,8 +935,6 @@ int virFileNBDDeviceAssociate(const char *file,
ret = 0;
cleanup:
- VIR_FREE(nbddev);
- VIR_FREE(qemunbd);
virCommandFree(cmd);
return ret;
}
@@ -996,7 +981,6 @@ int virFileDeleteTree(const char *dir)
{
DIR *dh;
struct dirent *de;
- char *filepath = NULL;
int ret = -1;
int direrr;
@@ -1008,6 +992,7 @@ int virFileDeleteTree(const char *dir)
return -1;
while ((direrr = virDirRead(dh, &de, dir)) > 0) {
+ VIR_AUTOFREE(char *) filepath = NULL;
struct stat sb;
if (virAsprintf(&filepath, "%s/%s",
@@ -1031,8 +1016,6 @@ int virFileDeleteTree(const char *dir)
goto cleanup;
}
}
-
- VIR_FREE(filepath);
}
if (direrr < 0)
goto cleanup;
@@ -1047,7 +1030,6 @@ int virFileDeleteTree(const char *dir)
ret = 0;
cleanup:
- VIR_FREE(filepath);
VIR_DIR_CLOSE(dh);
return ret;
}
@@ -1205,7 +1187,7 @@ static int
safezero_slow(int fd, off_t offset, off_t len)
{
int r;
- char *buf;
+ VIR_AUTOFREE(char *) buf = NULL;
unsigned long long remain, bytes;
if (lseek(fd, offset, SEEK_SET) < 0)
@@ -1226,15 +1208,12 @@ safezero_slow(int fd, off_t offset, off_t len)
bytes = remain;
r = safewrite(fd, buf, bytes);
- if (r < 0) {
- VIR_FREE(buf);
+ if (r < 0)
return -1;
- }
/* safewrite() guarantees all data will be written */
remain -= bytes;
}
- VIR_FREE(buf);
return 0;
}
@@ -1597,8 +1576,7 @@ virFileRelLinkPointsTo(const char *directory,
const char *checkLink,
const char *checkDest)
{
- char *candidate;
- int ret;
+ VIR_AUTOFREE(char *) candidate = NULL;
if (*checkLink == '/')
return virFileLinkPointsTo(checkLink, checkDest);
@@ -1610,9 +1588,7 @@ virFileRelLinkPointsTo(const char *directory,
}
if (virAsprintf(&candidate, "%s/%s", directory, checkLink) < 0)
return -1;
- ret = virFileLinkPointsTo(candidate, checkDest);
- VIR_FREE(candidate);
- return ret;
+ return virFileLinkPointsTo(candidate, checkDest);
}
@@ -1945,44 +1921,40 @@ virFileIsExecutable(const char *file)
*/
int virFileIsMountPoint(const char *file)
{
- char *parent = NULL;
- int ret = -1;
+ VIR_AUTOFREE(char *) parent = NULL;
+ int ret;
struct stat sb1, sb2;
if (!(parent = mdir_name(file))) {
virReportOOMError();
- goto cleanup;
+ return -1;
}
VIR_DEBUG("Comparing '%s' to '%s'", file, parent);
if (stat(file, &sb1) < 0) {
if (errno == ENOENT)
- ret = 0;
+ return 0;
else
virReportSystemError(errno,
_("Cannot stat '%s'"),
file);
- goto cleanup;
+ return -1;
}
if (stat(parent, &sb2) < 0) {
virReportSystemError(errno,
_("Cannot stat '%s'"),
parent);
- goto cleanup;
+ return -1;
}
- if (!S_ISDIR(sb1.st_mode)) {
- ret = 0;
- goto cleanup;
- }
+ if (!S_ISDIR(sb1.st_mode))
+ return 0;
ret = sb1.st_dev != sb2.st_dev;
VIR_DEBUG("Is mount %d", ret);
- cleanup:
- VIR_FREE(parent);
return ret;
}
@@ -2165,7 +2137,7 @@ virFileAccessibleAs(const char *path, int mode,
{
pid_t pid = 0;
int status, ret = 0;
- gid_t *groups;
+ VIR_AUTOFREE(gid_t *) groups = NULL;
int ngroups;
if (uid == geteuid() &&
@@ -2178,13 +2150,10 @@ virFileAccessibleAs(const char *path, int mode,
pid = virFork();
- if (pid < 0) {
- VIR_FREE(groups);
+ if (pid < 0)
return -1;
- }
if (pid) { /* parent */
- VIR_FREE(groups);
if (virProcessWait(pid, &status, false) < 0) {
/* virProcessWait() already reported error */
errno = EINTR;
@@ -2280,7 +2249,7 @@ virFileOpenForked(const char *path, int openflags, mode_t
mode,
int recvfd_errno = 0;
int fd = -1;
int pair[2] = { -1, -1 };
- gid_t *groups;
+ VIR_AUTOFREE(gid_t *) groups = NULL;
int ngroups;
bool created = false;
@@ -2298,16 +2267,12 @@ virFileOpenForked(const char *path, int openflags,
mode_t mode,
virReportSystemError(errno,
_("failed to create socket needed for '%s'"),
path);
- VIR_FREE(groups);
return ret;
}
pid = virFork();
- if (pid < 0) {
- ret = -errno;
- VIR_FREE(groups);
- return ret;
- }
+ if (pid < 0)
+ return -errno;
if (pid == 0) {
@@ -2372,7 +2337,6 @@ virFileOpenForked(const char *path, int openflags, mode_t
mode,
/* parent */
- VIR_FREE(groups);
VIR_FORCE_CLOSE(pair[1]);
do {
@@ -2573,7 +2537,7 @@ virFileRemove(const char *path,
{
pid_t pid;
int status = 0, ret = 0;
- gid_t *groups;
+ VIR_AUTOFREE(gid_t *) groups = NULL;
int ngroups;
if (!virFileRemoveNeedsSetuid(path, uid, gid)) {
@@ -2598,15 +2562,11 @@ virFileRemove(const char *path,
pid = virFork();
- if (pid < 0) {
- ret = -errno;
- VIR_FREE(groups);
- return ret;
- }
+ if (pid < 0)
+ return -errno;
if (pid) { /* parent */
/* wait for child to complete, and retrieve its exit code */
- VIR_FREE(groups);
if (virProcessWait(pid, &status, 0) < 0) {
/* virProcessWait() reports errno on waitpid failure, so we'll just
@@ -2738,7 +2698,7 @@ virDirCreate(const char *path,
struct stat st;
pid_t pid;
int status = 0, ret = 0;
- gid_t *groups;
+ VIR_AUTOFREE(gid_t *) groups = NULL;
int ngroups;
bool created = false;
@@ -2774,15 +2734,11 @@ virDirCreate(const char *path,
pid = virFork();
- if (pid < 0) {
- ret = -errno;
- VIR_FREE(groups);
- return ret;
- }
+ if (pid < 0)
+ return -errno;
if (pid) { /* parent */
/* wait for child to complete, and retrieve its exit code */
- VIR_FREE(groups);
if (virProcessWait(pid, &status, 0) < 0) {
/* virProcessWait() reports errno on waitpid failure, so we'll just
@@ -3047,13 +3003,13 @@ int virFileChownFiles(const char *name,
int ret = -1;
int direrr;
DIR *dir;
- char *path = NULL;
if (virDirOpen(&dir, name) < 0)
return -1;
while ((direrr = virDirRead(dir, &ent, name)) > 0) {
- VIR_FREE(path);
+ VIR_AUTOFREE(char *) path = NULL;
+
if (virAsprintf(&path, "%s/%s", name, ent->d_name) < 0)
goto cleanup;
@@ -3075,8 +3031,6 @@ int virFileChownFiles(const char *name,
ret = 0;
cleanup:
- VIR_FREE(path);
-
virDirClose(&dir);
return ret;
@@ -3138,19 +3092,14 @@ int
virFileMakePathWithMode(const char *path,
mode_t mode)
{
- int ret = -1;
- char *tmp;
+ VIR_AUTOFREE(char *) tmp = NULL;
if (VIR_STRDUP(tmp, path) < 0) {
errno = ENOMEM;
- goto cleanup;
+ return -1;
}
- ret = virFileMakePathHelper(tmp, mode);
-
- cleanup:
- VIR_FREE(tmp);
- return ret;
+ return virFileMakePathHelper(tmp, mode);
}
@@ -3158,8 +3107,7 @@ int
virFileMakeParentPath(const char *path)
{
char *p;
- char *tmp;
- int ret = -1;
+ VIR_AUTOFREE(char *) tmp = NULL;
VIR_DEBUG("path=%s", path);
@@ -3170,15 +3118,11 @@ virFileMakeParentPath(const char *path)
if ((p = strrchr(tmp, '/')) == NULL) {
errno = EINVAL;
- goto cleanup;
+ return -1;
}
*p = '\0';
- ret = virFileMakePathHelper(tmp, 0777);
-
- cleanup:
- VIR_FREE(tmp);
- return ret;
+ return virFileMakePathHelper(tmp, 0777);
}
@@ -3212,7 +3156,7 @@ virFileOpenTty(int *ttymaster, char **ttyName, int
rawmode)
* doesn't have to worry about that mess? */
int ret = -1;
int slave = -1;
- char *name = NULL;
+ VIR_AUTOFREE(char *) name = NULL;
/* Unfortunately, we can't use the name argument of openpty, since
* there is no guarantee on how large the buffer has to be.
@@ -3273,7 +3217,6 @@ virFileOpenTty(int *ttymaster, char **ttyName, int
rawmode)
if (ret != 0)
VIR_FORCE_CLOSE(*ttymaster);
VIR_FORCE_CLOSE(slave);
- VIR_FREE(name);
return ret;
}
@@ -3373,21 +3316,17 @@ virFileSkipRoot(const char *path)
int
virFileAbsPath(const char *path, char **abspath)
{
- char *buf;
-
if (path[0] == '/') {
if (VIR_STRDUP(*abspath, path) < 0)
return -1;
} else {
- buf = getcwd(NULL, 0);
+ VIR_AUTOFREE(char *) buf = getcwd(NULL, 0);
+
if (buf == NULL)
return -1;
- if (virAsprintf(abspath, "%s/%s", buf, path) < 0) {
- VIR_FREE(buf);
+ if (virAsprintf(abspath, "%s/%s", buf, path) < 0)
return -1;
- }
- VIR_FREE(buf);
}
return 0;
@@ -3487,7 +3426,7 @@ virFileRemoveLastComponent(char *path)
int virFilePrintf(FILE *fp, const char *msg, ...)
{
va_list vargs;
- char *str;
+ VIR_AUTOFREE(char *) str = NULL;
int ret;
va_start(vargs, msg);
@@ -3501,8 +3440,6 @@ int virFilePrintf(FILE *fp, const char *msg, ...)
ret = -1;
}
- VIR_FREE(str);
-
cleanup:
va_end(vargs);
@@ -3538,7 +3475,8 @@ int
virFileIsSharedFSType(const char *path,
int fstypes)
{
- char *dirpath, *p;
+ VIR_AUTOFREE(char *) dirpath = NULL;
+ char *p;
struct statfs sb;
int statfs_ret;
@@ -3558,7 +3496,6 @@ virFileIsSharedFSType(const char *path,
if ((p = strrchr(dirpath, '/')) == NULL) {
virReportSystemError(EINVAL,
_("Invalid relative path '%s'"), path);
- VIR_FREE(dirpath);
return -1;
}
@@ -3571,8 +3508,6 @@ virFileIsSharedFSType(const char *path,
} while ((statfs_ret < 0) && (p != dirpath));
- VIR_FREE(dirpath);
-
if (statfs_ret < 0) {
virReportSystemError(errno,
_("cannot determine filesystem for '%s'"),
@@ -3639,18 +3574,20 @@ virFileGetHugepageSize(const char *path,
static int
virFileGetDefaultHugepageSize(unsigned long long *size)
{
- int ret = -1;
- char *meminfo, *c, *n, *unit;
+ VIR_AUTOFREE(char *) meminfo = NULL;
+ char *c;
+ char *n;
+ char *unit;
if (virFileReadAll(PROC_MEMINFO, 4096, &meminfo) < 0)
- goto cleanup;
+ return -1;
if (!(c = strstr(meminfo, HUGEPAGESIZE_STR))) {
virReportError(VIR_ERR_NO_SUPPORT,
_("%s not found in %s"),
HUGEPAGESIZE_STR,
PROC_MEMINFO);
- goto cleanup;
+ return -1;
}
c += strlen(HUGEPAGESIZE_STR);
@@ -3663,13 +3600,10 @@ virFileGetDefaultHugepageSize(unsigned long long *size)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to parse %s %s"),
HUGEPAGESIZE_STR, c);
- goto cleanup;
+ return -1;
}
- ret = 0;
- cleanup:
- VIR_FREE(meminfo);
- return ret;
+ return 0;
}
# define PROC_MOUNTS "/proc/mounts"
@@ -3963,10 +3897,8 @@ virFileCopyACLs(const char *src,
int
virFileComparePaths(const char *p1, const char *p2)
{
- int ret = -1;
- char *res1, *res2;
-
- res1 = res2 = NULL;
+ VIR_AUTOFREE(char *) res1 = NULL;
+ VIR_AUTOFREE(char *) res2 = NULL;
/* Assume p1 and p2 are symlinks, so try to resolve and canonicalize them.
* Canonicalization fails for example on file systems names like 'proc' or
@@ -3975,19 +3907,13 @@ virFileComparePaths(const char *p1, const char *p2)
*/
ignore_value(virFileResolveLink(p1, &res1));
if (!res1 && VIR_STRDUP(res1, p1) < 0)
- goto cleanup;
+ return -1;
ignore_value(virFileResolveLink(p2, &res2));
if (!res2 && VIR_STRDUP(res2, p2) < 0)
- goto cleanup;
+ return -1;
- ret = STREQ_NULLABLE(res1, res2);
-
- cleanup:
- VIR_FREE(res1);
- VIR_FREE(res2);
-
- return ret;
+ return STREQ_NULLABLE(res1, res2);
}
@@ -4131,25 +4057,22 @@ virFileInData(int fd ATTRIBUTE_UNUSED,
int
virFileReadValueInt(int *value, const char *format, ...)
{
- int ret = -1;
- char *str = NULL;
- char *path = NULL;
+ VIR_AUTOFREE(char *) str = NULL;
+ VIR_AUTOFREE(char *) path = NULL;
va_list ap;
va_start(ap, format);
if (virVasprintf(&path, format, ap) < 0) {
va_end(ap);
- goto cleanup;
+ return -1;
}
va_end(ap);
- if (!virFileExists(path)) {
- ret = -2;
- goto cleanup;
- }
+ if (!virFileExists(path))
+ return -2;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(*value), &str) < 0)
- goto cleanup;
+ return -1;
virStringTrimOptionalNewline(str);
@@ -4157,14 +4080,10 @@ virFileReadValueInt(int *value, const char *format, ...)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid integer value '%s' in file '%s'"),
str, path);
- goto cleanup;
+ return -1;
}
- ret = 0;
- cleanup:
- VIR_FREE(path);
- VIR_FREE(str);
- return ret;
+ return 0;
}
@@ -4181,25 +4100,22 @@ virFileReadValueInt(int *value, const char *format, ...)
int
virFileReadValueUint(unsigned int *value, const char *format, ...)
{
- int ret = -1;
- char *str = NULL;
- char *path = NULL;
+ VIR_AUTOFREE(char *) str = NULL;
+ VIR_AUTOFREE(char *) path = NULL;
va_list ap;
va_start(ap, format);
if (virVasprintf(&path, format, ap) < 0) {
va_end(ap);
- goto cleanup;
+ return -1;
}
va_end(ap);
- if (!virFileExists(path)) {
- ret = -2;
- goto cleanup;
- }
+ if (!virFileExists(path))
+ return -2;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(*value), &str) < 0)
- goto cleanup;
+ return -1;
virStringTrimOptionalNewline(str);
@@ -4207,14 +4123,10 @@ virFileReadValueUint(unsigned int *value, const char
*format, ...)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid unsigned integer value '%s' in file '%s'"),
str, path);
- goto cleanup;
+ return -1;
}
- ret = 0;
- cleanup:
- VIR_FREE(path);
- VIR_FREE(str);
- return ret;
+ return 0;
}
@@ -4231,26 +4143,23 @@ virFileReadValueUint(unsigned int *value, const char
*format, ...)
int
virFileReadValueScaledInt(unsigned long long *value, const char *format, ...)
{
- int ret = -1;
- char *str = NULL;
+ VIR_AUTOFREE(char *) str = NULL;
+ VIR_AUTOFREE(char *) path = NULL;
char *endp = NULL;
- char *path = NULL;
va_list ap;
va_start(ap, format);
if (virVasprintf(&path, format, ap) < 0) {
va_end(ap);
- goto cleanup;
+ return -1;
}
va_end(ap);
- if (!virFileExists(path)) {
- ret = -2;
- goto cleanup;
- }
+ if (!virFileExists(path))
+ return -2;
if (virFileReadAll(path, INT_BUFSIZE_BOUND(*value), &str) < 0)
- goto cleanup;
+ return -1;
virStringTrimOptionalNewline(str);
@@ -4258,14 +4167,10 @@ virFileReadValueScaledInt(unsigned long long *value,
const char *format, ...)
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid unsigned scaled integer value '%s' in file
'%s'"),
str, path);
- goto cleanup;
+ return -1;
}
- ret = virScaleInteger(value, endp, 1024, ULLONG_MAX);
- cleanup:
- VIR_FREE(path);
- VIR_FREE(str);
- return ret;
+ return virScaleInteger(value, endp, 1024, ULLONG_MAX);
}
/* Arbitrarily sized number, feel free to change, but the function should be
@@ -4285,37 +4190,30 @@ virFileReadValueScaledInt(unsigned long long *value,
const char *format, ...)
int
virFileReadValueBitmap(virBitmapPtr *value, const char *format, ...)
{
- int ret = -1;
- char *str = NULL;
- char *path = NULL;
+ VIR_AUTOFREE(char *) str = NULL;
+ VIR_AUTOFREE(char *) path = NULL;
va_list ap;
va_start(ap, format);
if (virVasprintf(&path, format, ap) < 0) {
va_end(ap);
- goto cleanup;
+ return -1;
}
va_end(ap);
- if (!virFileExists(path)) {
- ret = -2;
- goto cleanup;
- }
+ if (!virFileExists(path))
+ return -2;
if (virFileReadAll(path, VIR_FILE_READ_VALUE_STRING_MAX, &str) < 0)
- goto cleanup;
+ return -1;
virStringTrimOptionalNewline(str);
*value = virBitmapParseUnlimited(str);
if (!*value)
- goto cleanup;
+ return -1;
- ret = 0;
- cleanup:
- VIR_FREE(path);
- VIR_FREE(str);
- return ret;
+ return 0;
}
/**
@@ -4333,30 +4231,26 @@ virFileReadValueBitmap(virBitmapPtr *value, const char
*format, ...)
int
virFileReadValueString(char **value, const char *format, ...)
{
- int ret = -1;
- char *str = NULL;
- char *path = NULL;
+ int ret;
+ VIR_AUTOFREE(char *) str = NULL;
+ VIR_AUTOFREE(char *) path = NULL;
va_list ap;
va_start(ap, format);
if (virVasprintf(&path, format, ap) < 0) {
va_end(ap);
- goto cleanup;
+ return -1;
}
va_end(ap);
- if (!virFileExists(path)) {
- ret = -2;
- goto cleanup;
- }
+ if (!virFileExists(path))
+ return -2;
ret = virFileReadAll(path, VIR_FILE_READ_VALUE_STRING_MAX, value);
if (*value)
virStringTrimOptionalNewline(*value);
- cleanup:
- VIR_FREE(path);
- VIR_FREE(str);
+
return ret;
}
--
1.8.3.1
--
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