require signal.h
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@@ -39,6 +39,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include <unistd.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <ctype.h>
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#include <err.h>
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#include <err.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/wait.h>
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