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man: Speicfy exact return values of sd_bus_message_enter_container
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<refsect1>
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<title>Return Value</title>
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<para>On success, these functions return a non-negative integer. On failure, they return a negative
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errno-style error code.</para>
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<para>On success, these functions return a non-negative integer.
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<function>sd_bus_message_open_container()</function> and <function>sd_bus_message_close_container()</function>
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return 0.
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<function>sd_bus_message_enter_container()</function> returns 1 if it successfully opened a new container, and 0 if
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that was not possible because the end of the currently open container or message was reached.
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<function>sd_bus_message_exit_container()</function> returns 1 on success.
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On failure, all of these functions return a negative errno-style error code.</para>
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<refsect2>
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<title>Errors</title>
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