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util: new function virFileLength()
This new function just calls fstat() (if provided with a valid fd) or stat() (if fd is -1) and returns st_size (or -1 if there is an error). We may decide we want this function to be more complex, and handle things like block devices - this is a placeholder (that works) for any more complicated function.
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@ -1578,6 +1578,7 @@ virFileIsLink;
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virFileIsMountPoint;
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virFileIsSharedFS;
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virFileIsSharedFSType;
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virFileLength;
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virFileLinkPointsTo;
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virFileLock;
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virFileLoopDeviceAssociate;
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@ -1735,6 +1735,40 @@ virFileActivateDirOverride(const char *argv0)
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}
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}
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/**
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* virFileLength:
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* @path: full path of the file
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* @fd: open file descriptor for file (or -1 to use @path)
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*
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* If fd >= 0, return the length of the open file indicated by @fd.
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* If fd < 0 (i.e. -1) return the length of the file indicated by
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* @path.
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*
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* Returns the length, or -1 if the file doesn't
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* exist or its info was inaccessible. No error is logged.
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*/
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off_t
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virFileLength(const char *path, int fd)
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{
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struct stat s;
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if (fd >= 0) {
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if (fstat(fd, &s) < 0)
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return -1;
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} else {
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if (stat(path, &s) < 0)
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return -1;
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}
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if (!S_ISREG(s.st_mode))
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return -1;
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return s.st_size;
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}
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bool
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virFileIsDir(const char *path)
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{
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@ -179,6 +179,7 @@ char *virFileFindResourceFull(const char *filename,
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void virFileActivateDirOverride(const char *argv0)
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ATTRIBUTE_NONNULL(1);
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off_t virFileLength(const char *path, int fd) ATTRIBUTE_NONNULL(1);
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bool virFileIsDir (const char *file) ATTRIBUTE_NONNULL(1);
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bool virFileExists(const char *file) ATTRIBUTE_NONNULL(1);
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bool virFileIsExecutable(const char *file) ATTRIBUTE_NONNULL(1);
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