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util: Introduce virFileWaitForExists
Since we have a number of places where we workaround timing issues with devices, attributes (files in general) not being available at the time of processing them by calling usleep in a loop for a fixed number of tries, we could as well have a utility function that would do that. Therefore we won't have to duplicate this ugly workaround even more. Signed-off-by: Erik Skultety <eskultet@redhat.com>
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@ -1756,6 +1756,7 @@ virFileStripSuffix;
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virFileTouch;
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virFileUnlock;
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virFileUpdatePerm;
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virFileWaitForExists;
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virFileWrapperFdClose;
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virFileWrapperFdFree;
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virFileWrapperFdNew;
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@ -4177,3 +4177,34 @@ virFileReadValueString(char **value, const char *format, ...)
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VIR_FREE(str);
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return ret;
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}
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/**
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* virFileWaitForExists:
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* @path: absolute path to a sysfs attribute (can be a symlink)
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* @ms: how long to wait (in milliseconds)
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* @tries: how many times should we try to wait for @path to become accessible
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*
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* Checks the existence of @path. In case the file defined by @path
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* doesn't exist, we wait for it to appear in @ms milliseconds (for up to
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* @tries attempts).
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*
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* Returns 0 on success, -1 on error, setting errno appropriately.
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*/
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int
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virFileWaitForExists(const char *path,
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size_t ms,
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size_t tries)
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{
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errno = 0;
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/* wait for @path to be accessible in @ms milliseconds, up to @tries */
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while (tries-- > 0 && !virFileExists(path)) {
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if (tries == 0 || errno != ENOENT)
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return -1;
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usleep(ms * 1000);
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}
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return 0;
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}
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@ -349,6 +349,8 @@ int virFileReadValueScaledInt(unsigned long long *value, const char *format, ...
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int virFileReadValueString(char **value, const char *format, ...)
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ATTRIBUTE_FMT_PRINTF(2, 3);
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int virFileWaitForExists(const char *path, size_t ms, size_t tries);
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int virFileInData(int fd,
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int *inData,
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